Teeth whitening lamp inurl ipb. Features and disadvantages of the cold light teeth whitening technique. From chemical in-office bleaching

The latest advances in aesthetic dentistry offer teeth whitening with cold light. We will write about the varieties, advantages, price and reviews in this article. After all, this method is quite popular due to its safety and painlessness.

Every year everyone more people Are you thinking about brightening your teeth and achieving a beautiful smile? And dentists are developing new systems for home and office whitening, trying to make this procedure neat, simple and accessible to most people.

What is cold teeth whitening?

This system enamel lightening is based on the use of a gel with a special chemical composition and a lamp that can activate and accelerate its action. And if in various types While photobleaching uses radiation that heats the tooth and can thereby harm it, a cold light lamp is gentle on the enamel structure.

Passing through many filters, the ultraviolet and infrared spectra are removed from the directed beam, thereby resulting in teeth whitening with cold light. The patient will not feel the effects of the lamp, overheating, pain, etc. Thanks to this, such methods quickly won their clientele.

Dentists and their patients who have already tried this technique themselves, highlight the following advantages of cold bleaching:

• safety for the enamel structure;
• quick effect;
• the duration of the whole session is no longer than an hour;
• lightening can reach 6-10 tones;
• the procedure is absolutely painless;
• ease of implementation;
• absence side effects;
• the result will last up to a year.

Among the disadvantages, it should be noted that such a system will not be able to change the natural gray shade of the enamel, and also affect some other cases of darkening of teeth. The cost of such a procedure will not be affordable for everyone. And not everyone can undergo it, however, like many other dental services.

Indications and contraindications

It is advisable to use such whitening in any case of darkening of the enamel. It will be especially effective when teeth are naturally white but have become yellowed due to smoking, plaque, poor oral hygiene and frequent consumption of multi-colored foods with coloring pigments.

With all the safety this method Doctors indicate contraindications for bleaching:

In any case, before carrying out such a procedure, you need qualified consultation with a specialist who will determine the adequacy of its implementation. It should be borne in mind that when taking certain antibiotics (tetracycline), the natural gray shade of the enamel and damage to the tooth, no whitening system can significantly lighten the dentition.

Action chemical substance can affect the natural pigment of natural fabrics, so the color artificial materials Will not change. This should be remembered when many orthodontic structures and therapeutic fillings are installed. After whitening, they will have to be replaced with lighter ones so as not to disturb the aesthetics of the smile.

Photos before and after

Types of technologies

Most of the varieties of modern whitening came to us from the USA. Some have not yet been fully tested in the country, while others have already won Russian clients. Let us describe those of them that are based on the influence of cold light and ensure the safety of the procedure:

1. – created on special technology LightBridge. IN in this case A halogen lamp is used, which completely eliminates ultra-violet rays.
2. Luma Cool is less known here, but has earned the trust of Americans. Diode lighting is used here, although the action and result are similar to the previous one.
3. – another new product that came from afar. The chemical composition is activated by turning on the LED lamp. Moreover, in addition to the in-office whitening option, there are also home kits from this brand, which makes it possible to maintain the desired shade of teeth on an ongoing basis and not have to go to the dentist for this.

The cost of each of the procedures described varies slightly, and it may be difficult to find each of them in your city. After all, what has just come to the market does not appear everywhere immediately. Therefore, sometimes it is not so much the desired method that is chosen, but one that is more accessible to the patient.

And if your city does not have any of the options you have chosen, then try using a product with a similar effect.

Nuances of preparation

Even before starting actual whitening, you need to go through some preparatory stages. And although they increase the price of the entire procedure, as well as the time spent in the dentist’s chair, you cannot do without them:

• Examination of the oral cavity and elimination of all diseases, inflammations and other troubles with teeth or periodontal tissues. If any defect is present, bleaching is contraindicated.
• It is also important to remove plaque, and especially so that the gel acts directly on the enamel. This achieves best result lightening.
• For future comparison, the dentist will definitely evaluate the initial shade of the teeth using the Vita scale. Cold light whitening promises to change the color of your smile by up to 10 shades. And although in each case the effect will be different, it is still interesting to know its effectiveness both for the doctor and for the patient himself.
• Immediately before the procedure begins, the person must wear protective devices and install the retractor. Thus, nothing unnecessary will get into the eyes or mucous membranes, and the whole process will be as safe as possible for health.

How is the procedure carried out?

Regardless of the lamp used and the specific method, all cold light systems will go through similar stages:

1. Apply to the surface of the teeth chemical composition in the form of a gel, which is the main whitening agent.
2. To start the reaction, exposure to a lamp is necessary. It is turned on and directed to the smile area. They are kept for a certain amount of time, usually 10-15 minutes.
3. Depending on the desired result, three whitening sessions in a row can be performed in one visit to the doctor. Each time they evaluate the achieved result and decide whether to continue or not.
4. At the end, the gel is washed off and recommendations are given on hygiene and diet to preserve the whiteness of your smile for a longer period.

If the patient, after three applications of the product, is dissatisfied with the lightening effect and wants to increase its intensity, then the procedure can be repeated after a week.

Video: I got my teeth whitened! Cold bleaching.

Price

Each type of cold light whitening has its own price. To figure out how much the option you choose costs, you need to contact the clinic where it will be performed. The average cost of such a procedure in Moscow is: Beyond Polus – 10-19 thousand rubles, Luma Cool – 6000-23000, and Amazing White – 10 thousand, if you choose the in-office whitening method.

For Kyiv, prices do not differ so much. Beyond Polus will cost 2200-3000 hryvnia, Luma Cool – 2500, and Amazing White also costs about 2500 hryvnia.

Although it is worth remembering that from preliminary preparation, professional cleaning, necessary treatment, replacement of fillings or other materials, the final cost of the entire procedure can increase significantly in each case.

Cold bleaching is a type of photo-bleaching systems that involve the use of a bleaching gel in combination with light exposure, acting as a catalyst. Unlike the most popular ZOOM photobleaching, which uses ultraviolet or LED lamps with air cooled teeth, cold whitening systems involve the use of halogen blue light. The latter does not have a heating effect, which significantly reduces the unpleasant and sometimes even painful sensations from the procedure.

Cold bleaching systems

Today, Moscow dental clinics use several cold light whitening systems.

Beyond

One of the most popular is Beyond, which is based on patented LightBridge technology. It provides uniform light exposure from a halogen lamp without ultraviolet radiation and heating.

Price - from 8,000 rubles.

Luma Cool

Luma Cool whitening, very popular in the USA, but almost unknown in Russia, is also based on the use of cold light. This is the only technology that uses diode lamps instead of halogen lamps.

Price - from 12,000 rubles.

Amazing White

Another American whitening system, Amazing White, uses cold light from an LED lamp with blue, red and violet rays.

Price - from 10,000 rubles.

How does cold light whitening differ from other techniques?

From home professional whitening (using tray and gel)

Cold whitening is performed by a doctor in a dental office. The oxygen gel for this procedure has a higher concentration of hydrogen peroxide (35 - 37%) compared to home whitening compositions (10 - 12% concentrate), therefore the effect of cold bleaching is much more noticeable. In addition, a home whitening course lasts from several weeks to a month, while teeth whitening with cold light takes 45 to 90 minutes.

From chemical in-office bleaching

Chemical bleaching, unlike cold light bleaching, does not involve a catalyst in the form of ultraviolet light. The result is achieved due to the highest possible concentration of the gel (up to 45% hydrogen peroxide concentrate), as well as a longer waiting period: the gel is applied to the teeth for 25 - 30 minutes, usually in two approaches. In practice, this is not always safe, and may also cause pain. Cold whitening is a gentler option to make your teeth whiter. A less concentrated oxygen gel is used here, and the procedure itself consists of three cycles of 10 - 15 minutes. In this case, the effect of chemical and cold bleaching is usually the same.

From photobleaching with hot light

Cold bleaching, as mentioned above, is also photobleaching, since it involves the use of a gel (reagent) and light (catalyst). But using the cold light of a halogen or diode lamp is a big bonus of this procedure. The advantage is that low temperature light waves allows you to whiten your teeth without damaging tooth enamel or causing pain. Don't worry: during the procedure your teeth will not shrink from the cold. The definition of “cold” is explained by the use of blue light, which does not heat tooth enamel, in contrast to whitening with hot light from an LED lamp, which is unsafe for teeth and oral mucosa.

From laser whitening

Cold whitening is less effective than laser whitening. The latter takes less time (the session lasts no more than 20 minutes) and at the same time allows you to achieve the highest whitening effect. The fact is that laser radiation has a dense directed beam flux, while light from ultraviolet lamp during cold bleaching, it dissipates - and the effect of the whitening gel slows down and weakens. Patients often note that after laser whitening, their teeth remain white longer - from 1.5 to 2.5 years. Of course, a lot depends on the natural shade of tooth enamel, oral hygiene and the frequency of consumption of “forbidden” products (coffee, black tea, dark berries and others) that stain teeth. But teeth whitening with a cold light lamp also has an important advantage - this procedure will not hit your wallet hard. Its cost is about 5,000 - 12,000 rubles (for comparison: the average price of laser whitening in metropolitan clinics starts from 20,000 rubles).

The key to teeth whitening is preparation!

If you have problems with the health of your teeth and oral cavity (caries, gingivitis, periodontitis, dental hypersensitivity), the first thing you need to do is eliminate them.

With teeth full order? Then take care of professional oral hygiene. Before cold whitening, it is very important to remove plaque and tartar deposits, as their presence can worsen the results of the procedure.

Next, the dentist must determine the original color of your tooth enamel using the standardized VITA shade chart. Cold light whitening will make teeth 6 to 10 shades whiter if the cause of their yellowness is smoking or exposure to food coloring. If the enamel has a grayish tint, you can only whiten your teeth by 2 - 3 shades. And remember: fillings, crowns, bridges, veneers and other orthopedic structures cannot be whitened.

Before starting the procedure, it is important to ensure the safety of your eyes and mouth. The doctor will offer you special glasses and install a structure in your mouth that will prevent your jaws from closing and your cheeks and lips from touching your teeth. The gums also need protection - the doctor will apply a quick-drying agent to them that forms protective film. Drying the tooth surface - finishing touch preparatory process.

The most popular today are lamps powered by LED (LED) - diodes that emit cold light. LED lamps provide safer teeth whitening using special gels that are activated by light. Numerous studies have proven that LEDs minimally increase the temperature of tooth tissue, resulting in a reduced risk of complications.

The essence of the method

Teeth whitening is a chemical reaction of pigment oxidation. When teeth are lightened with a gel and a lamp, the active components are hydrogen peroxide and carbamide peroxide, which are activated under the influence of light from an LED lamp. Carbamide peroxide and hydrogen peroxide are able to penetrate through enamel and dentin, oxidizing the pigments that color the tooth. As a result of the reaction, hydrogen peroxide decomposes into water, oxygen and perhydroxyl, while oxidized pigments are washed out of the tooth tissue along with water.

Indications and contraindications

An important step before the whitening procedure is to assess the condition of the dentition and identify all possible contraindications. There are several main indications for whitening with an LED lamp:

• Discoloration of teeth as a result of non-carious lesions - hypoplasia, fluorosis.
• Presence of white spots on the enamel.
• Change in tooth color after depulpation.
• Tetracycline teeth (pathology associated with the accumulation of tetracycline in hard tissues).
• Age-related changes in enamel color.
• Food coloring.

There are many contraindications to this technique, including:

• The presence of carious cavities on the teeth is a relative contraindication; the procedure can be performed after sanitation of the oral cavity.
• Large quantities - known to not bleach, so the result may not meet expectations.
• Crowns on the front teeth - in this case, you will have to replace the structures with new, lighter ones.
• Diseases of the oral mucosa - the procedure is carried out only after complete recovery.
• Too much thin layer enamels.
• The presence of hypersensitivity, since after the whitening procedure, increased pain symptoms are possible.
• Hypersensitivity to hydrogen peroxide and carbamide peroxide.
• The presence of malignant tumors in the human body.
• Taking a course of chemotherapy.
• Pregnancy and period breastfeeding– temporary contraindication.
• The patient's age is under 18 years.

How does the teeth whitening procedure work with a lamp?

Teeth whitening always begins with preparing the mouth for the procedure. A special oil is applied to the lips, which prevents the appearance of cracks when putting on the mouth opener. After this, a retractor is put on, which retracts the cheeks and lips, and isolation begins. Place napkins behind the cheeks to prevent the whitening gel from getting on the mucous membrane and causing irritation. The gums are isolated with a special light-curing material, which is carefully applied along the line of the necks of the teeth and illuminated with a lamp.

After complete isolation, an active gel is applied to the dried teeth. You should know that only incisors, canines and premolars are whitened. After applying the gel, it is illuminated with a lamp for 10-15 minutes, then the composition is removed from the teeth and the result is evaluated. If necessary, the procedure is repeated again, while total there should be no more than three approaches. On average, the entire procedure takes about an hour, the result is always individual - it is difficult to predict in advance.

Advantages and disadvantages

The main advantage of a diode lamp over others is the almost complete absence of harm to the hard tissues of teeth. This is due to the fact that the light beam passes through special filters that neutralize ultraviolet and infrared radiation. In addition, the temperature of the enamel surface practically does not increase, thereby eliminating the possibility of overheating of the pulp and thermal burn of the mucous membrane.

In addition, cold whitening has other advantages:

• Short duration of the procedure.
• During the lightening process, the patient experiences virtually no discomfort or pain.
• You can get the desired result the first time.
• The ability to eliminate even the most complex discolorations.

This method has few disadvantages - it is long list contraindications and quite high cost.

The difference between teeth whitening with a lamp and other methods

Teeth whitening LED lamp differs from other methods in several ways. For example, unlike chemical method, the duration of the procedure is 2 times shorter due to the presence of an activator in the form of a lamp. In addition, during the chemical lightening process, the patient may experience some discomfort and painful shooting due to the higher concentration of the active gel.

Oxygen gels are used in lower concentrations, so the effect is not noticeable immediately, but only after a whole course of procedures. Photobleaching with hot light lamps is also carried out using a gel and a catalyst in the form of a lamp, however heat light waves can damage enamel and cause pain. In addition, if there are errors in insulation, there is a risk of developing a burn to the mucous membrane.

Unlike the method using cold light, it takes less time, and the effect may be more noticeable. This is due to the fact that the flow laser radiation more dense and does not dissipate, therefore it acts directionally. The cost of teeth whitening using a laser is slightly higher than that of photo whitening.

Useful video about Zoom teeth whitening

Among home remedies for whitening, there are many original and unusual devices, for example, an LED lamp for teeth whitening. It is believed that the kit allows you to quickly and painlessly create a Hollywood smile. Let's figure out how it works and how effective it is.

Very often, chemical reagents are used for cosmetic teeth whitening. In particular, this is carbamide peroxide. Lamp teeth whitening is another subtype of chemical whitening. To lighten the pigment, it is necessary to apply a special lightening gel, and a lamp is used to enhance and speed up the reaction. In its normal state, the gel develops pigment in 8–12 hours, and with a lamp – in just 1–2 hours.

Before using the lamp, it is advisable to have your teeth professionally cleaned. For example, clean the air flow. It is imperative to conduct a preventive examination at the dentist to exclude the presence of microtraumas in the gums and carious holes in the teeth.

Air flow cleaning

If you want to achieve excellent result, need to do full cycle preparatory activities:

• bring the oral cavity into proper condition;
• update old fillings;
• get rid of oral infections;
• do an allergy test;
• clear upper layer enamel from pigmented spots.

After the preparatory measures, the gel is applied to the teeth and the lamp is turned on. Be sure to wait until the light segment is ready for use. A special indicator on the device will report this.

The gel-treated areas are illuminated with a lamp for 45–60 minutes. After which the gel is carefully cleaned from the oral cavity.

Typically, 2-3 lightening procedures are necessary to achieve optimal results.

Dmitry Sidorov

Orthopedic dentist

You shouldn’t get too carried away with such lightening, because maximum effect is achieved only on the third day after the procedure. If you re-lighten before this, the final tooth color may turn out to be unnaturally bright.

Only in case correct use instructions, the effectiveness of the procedure will outshine the side effects and harm from it.

Before and after lamp bleaching

Harm and contraindications

All methods of chemical bleaching are harmful in one way or another. Peroxide (carbamide, hydrogen, etc.) penetrates into dentin through the enamel, violating its integrity. In addition, the LED teeth whitening lamp causes ossification of dentin. Due to this, its elasticity changes, and in some cases this can lead to a pinched nerve.

In addition, peroxide is an acid that causes serious allergic reactions, can lead to gum burns.

Allergies after using peroxide

Constant exposure to acid, including during teeth whitening with an LED lamp, leads to increased sensitivity of the enamel. People suffering from this pathology are forced to give up sour, cold and hot foods and drinks, and constantly feel pain in their teeth. In this case, it will be necessary to carry out additional prevention and treatment of nerve endings damaged by acid exposure. And if this doesn’t help, the nerves will have to be removed.

The use of peroxides is unacceptable in the third trimester of pregnancy, because it can lead to disruption of the integrity of the dentition and cause health problems in the child.

Let's sum it up

LED teeth whitening is a fairly effective, but expensive procedure. It requires not only the active composition, but also a special developer. It is much easier and safer to carry out such whitening in a dental clinic under the supervision of a doctor.

LED lamp for dentists LED lamp for home whitening

This will help avoid side effects and unexpected troubles. Towards folk remedies and other types of chemical lightening, the use of LED rays can significantly reduce the harm of peroxide, but not eliminate it completely.

In the video, a popular blogger reviews a home whitening kit with an LED lamp:

Dental patients are often offered new method— lamp teeth whitening. Whitening is carried out with a LED lamp with cold light. Many people confuse this procedure with a procedure that uses an ordinary incandescent lamp, refusing to bleach using this method. Previously used lamps contributed to cracking of tooth enamel, spoiling it and causing a lot of unpleasant sensations. The impact of an LED lamp on tooth enamel occurs differently. What is this whitening method and how does it work?

It would be incorrect to say that teeth whitening with an LED lamp occurs due to the light it produces. In fact, light cannot affect tooth enamel. Its use is aimed at creating chemical reaction between the reagent used and the pigments that are inside the enamel and color it.

The reagent is a special gel in the formula, which contains hydrogen peroxide in high concentration. Thanks to light exposure, a special form of oxygen with a highly active effect begins to form from it, which penetrates into the tooth tissue, oxidizing pigments. Thus, the light emanating from the lamp is a kind of catalyst, which stimulates the chemical process. The main advantage of this procedure is the low temperature of light waves. This allows the whitening procedure to be carried out painlessly for the patient and without harming the tooth enamel.

Carrying out the procedure

Teeth whitening with gel and lamp is an office procedure that should only be performed by a specialist with certain experience. Otherwise, in addition to an unsatisfactory result, the patient may suffer injuries to the oral mucosa. The procedure itself lasts about 1 hour, going through several stages.

1. Preparatory stage - professional cleaning oral cavity. Existing plaque and tartar deposits are removed from the teeth. This procedure itself will help make the teeth lighter, and this will allow you to maximally select the tone of the tooth enamel that the patient wants to see in the end. The initial color is determined through application and if the result is satisfactory to the patient, the dentist moves on to the next whitening stage.
2. The second stage begins with the implementation of oral safety measures. To ensure minimal contact with the teeth, cheeks and lips are isolated using a variety of napkins and films. To prevent the gums from coming under the aggressive influence of the whitening gel, and to avoid chemical burns on the soft tissues, they are covered protective composition. Most often this composition is. After application, it quickly hardens, forming a protective film.
3. The third stage is the whitening procedure. The surface of the teeth is pre-dried, and then it is evenly covered with active gel. After irradiating the teeth with an LED lamp for 10 minutes, this gel is removed. If the result does not satisfy the patient, the entire procedure is repeated again.

No more than three approaches can be performed during one visit to the dentist. All these steps will take about an hour. If this was not enough, a second visit to the dentist should only take place a week later.

Efficiency of whitening with LED lamp

Teeth whitening with LED lamp is sufficient effective method. In one visit to the dental office to whiten your teeth, you can lighten your tooth enamel by 6–10 shades. This is the case if the tooth enamel has turned yellow from exposure to food dyes or from smoking abuse. When tooth enamel has become gray, its lightening becomes possible only by a couple of tones. Minimal success in the procedure can also be observed in those patients whose enamel has changed color under the influence of tetracycline antibiotics, as well as if there is an excess of fluoride in the body.

Speaking about the duration of the result, it depends on what natural shade of enamel the patient has, and to what extent the doctor’s further recommendations will be followed.

Causes of darkening of tooth enamel

In order for lamp teeth whitening to give the most positive results, you need to understand the reasons for the darkening of the enamel. In many cases, it will be enough to eliminate the negative impact factor so that the enamel acquires its natural shade.

The structure of dental tissue is quite porous. The enamel that covers the base of the tooth is translucent and cannot affect its overall color. Dark shade comes from dentin, which is visible through a thin layer of enamel. But why does it darken if the enamel itself is strong enough to pass through negative factors? The reason lies in insufficient hygiene and love for solid food. Seeds, nuts, grilled candies, sour drinks and all similar products contribute to damage to the top layer of teeth, and then the dye easily penetrates into the tooth tissue, staining the dentin.
The main factors contributing to the darkening of enamel:

• The most common reason is the consumption of products that contain a large concentrate of natural dyes. This could be: beets, blueberries or currants, cranberries or strawberries, coffee, strong tea, etc. In this case, careful hygiene will be the best way to get rid of the problem of darkening of teeth.
• The color of the enamel also changes in heavy smokers. The culprit in this case is the tar in the cigarette. As they settle on the surface of the tooth, they begin to gradually destroy tooth enamel. The best solution would be to give up cigarettes, but if the patient cannot do this, then it is worth paying more attention to hygiene procedures.
• The tooth may darken due to trauma during which the neurovascular bundle was damaged.
• The color also changes due to depulpation - when the nerve is removed from the tooth.
• Staining may occur due to the specific type of filling material used to seal the nerve canal.
• Progressive caries. This disease is initial stage its development is manifested only by small black dots, but if it is not cured in time, caries begins to progress, first destroying the enamel and then dentin.
• Teeth may have congenital lesions, which are not classified as carious lesions. Except dark color enamels, they differ in a different structure and shape.
• Excess fluoride in consumed water can provoke the development of diseases such as endemic. When fluorosis begins to develop, dark areas, spots, or chalky streaks form on the teeth. All this leads to the destruction of enamel, and then dentin.
• Taking tetracycline antibiotics during pregnancy negatively affects the condition of the child’s teeth. The baby's teeth acquire dark color even during the period of intrauterine development.

The first two reasons for color changes are easily eliminated, but only in the first stages of development. In advanced situations, the whiteness of teeth cannot be restored. The problem is that the darkening becomes part of the healthy tooth and is now its natural shade.

LED lamp and its advantages

The main advantage of use is the absence of a threat to the patient’s health. This method passed all tests and is considered one of the safest. The rays that are reproduced by the lamp pass through a special filter, the task of which is to neutralize harmful effects infrared waves and ultraviolet. Thus, the enamel surface is exposed to a temperature no higher than 37.6ºC. In addition, other advantages of this procedure can be noted:

1. Short time for the whitening procedure.
2. The ability to get the desired result the first time.
3. The gel used contains components that help reduce sensitivity to the procedure.
4. The effectiveness of the system makes it possible to eliminate defects such as age-related darkening and darkening caused by fluorosis.

The disadvantage of the teeth whitening procedure with an LED lamp can be considered the cost of the session, the price of which varies between 7,000 and 20,000 rubles and a large list of contraindications.

Indications for teeth whitening with an LED lamp and possible contraindications

Indications for use may include:

• uniform tooth pigmentation;
• darkened enamel, without whitish spots and dark stripes;
• in cases where the tooth does not need to be given a certain form or size.

For contraindications, the list is longer:

• increased sensitivity;
• enamel with defects;
• It is not recommended to carry out bleaching during lactation or pregnancy (although no special studies have been conducted);
• special intolerance to hydrogen peroxide or other components that are part of the gel used;
• a large number of existing fillings, crowns or installation of fixed dentures;
• problems with the temporomandibular joint;
• limited age category of patients (under 16 years of age is not recommended);
• general diseases of patients: uncontrolled arterial pressure, asthma, tumors, etc.;
• teeth that have damage such as chips, carious cavities, periodontitis, defects with fillings or crowns, etc.

The dentist may refuse the whitening procedure to a certain category of patients. As a rule, it includes those patients who neglect the doctor’s recommendations by not performing the prescribed procedures.

The largest number of teeth whitening procedures with an LED lamp includes 3 sessions. Each subsequent one can be completed only after a week. A positive result lasts 1–3 years. These terms depend on how well the patient adheres to the dentist’s recommendations and on the natural structure of the tooth. You can prepare your teeth for the whitening procedure by undergoing remineralization therapy. But the main rule that will help maintain a positive result for a long time is that after undergoing the procedure, do not eat foods with a large dye concentrate for a week.