Teeth Whitening

Having white and well-maintained teeth enhances an individual's smile aesthetics while also highlighting a sense of cleanliness and self-confidence. Smoking, tea-coffee consumption, certain medications, aging, and inadequate oral hygiene can lead to tooth discoloration. These color changes can be safely corrected under dental supervision in a clinical setting or with home-based methods planned by the dentist.

Teeth whitening is an aesthetic dentistry procedure that aims to lighten the natural color of teeth by several shades, which teeth may have lost over time due to various internal and external factors. The teeth whitening process does not achieve a completely artificial whiteness. However, it can give the existing natural color a brighter and healthier appearance. It is crucial for the application to be evaluated by a dentist, for a personalized method to be chosen, and for it to be carried out in accordance with instructions, both for effectiveness and the preservation of oral health. Dentist Emin Serhat Arıkan, who serves in his clinic in Adana, answered questions regarding teeth whitening application methods, possible side effects, post-treatment care, and frequently asked questions.

What is Teeth Whitening?

Teeth whitening is an aesthetic dentistry procedure that aims to remove colored organic and inorganic substances accumulated over time in the enamel and dentin layers of the teeth, with the help of special peroxide-based (containing carbamide peroxide or hydrogen peroxide) whitening agents. This procedure, rather than completely changing the natural color of the teeth, lightens the existing color by several shades to give a brighter and healthier appearance. Although the concentration of chemical substances used during whitening is effective on the results, high peroxide ratios can increase the risk of sensitivity and abrasion in tooth enamel. Therefore, teeth whitening application should be planned and carried out under the supervision of a dentist, taking into account the individual's tooth structure and oral health.

What are the Causes of Tooth Discoloration?

Teeth changing color over time or suddenly can lead to aesthetic concerns and may also be indicative of some underlying dental or systemic conditions. Tooth discolorations generally occur due to intrinsic and extrinsic factors.

Physiological (Age-Related) Discoloration

Throughout life, as tooth enamel thins and the underlying dentin layer becomes more prominent, teeth can naturally take on a darker color.

Discoloration Due to Amalgam Fillings

Over time, amalgam fillings can cause a gray or near-black discoloration as the metal ions they contain seep into the tooth tissue.

Antibiotic Exposure in Early Childhood

Especially tetracycline group antibiotics used during tooth development can bind to tooth tissue, leading to permanent yellow, brown, or gray discolorations.

Effect of Antibiotic Use During Pregnancy

Some antibiotics used by the mother during pregnancy can affect the baby's tooth buds, setting the stage for intrinsic tooth color changes in later years.

Internal Color Change Due to Root Canal Treatment

After root canal treatment, tissue residues remaining in the canal or the filling materials used can cause the tooth to darken internally over time.

Surface Discoloration Due to Dietary Habits

Coffee, tea, cigarettes, tobacco products, red wine, and long-term use of mouthwash can trigger pigment accumulation on the surface of tooth enamel.

Discoloration Problems Due to Trauma

A blow to the tooth can damage or kill the living tissue (pulp) inside the tooth, leading to bleeding and the seepage of blood products into the dentin, causing dark discoloration.

How is the Teeth Whitening Procedure Applied and What are the Methods?

Teeth whitening is an aesthetic dentistry procedure that aims to remove discolorations on the tooth surface or, when deemed necessary, within the internal structure of the tooth, using peroxide-based (hydrogen-carbamide) whitening materials. The method to be used is determined by the dentist after evaluating the level of discoloration, tooth structure, and the individual's oral health status. Teeth whitening techniques are generally examined in four main groups: in-office (laser whitening), at-home, combined, and single tooth (internal) whitening.

In-Office Teeth Whitening (Laser Method): In this method applied in a clinical setting, the whitening gel applied to the teeth is activated with the help of special light or laser. The procedure takes an average of 45–60 minutes, and significant whitening is usually achieved in a single session. It is a painless procedure, and short-term sensitivity may be experienced after the procedure.

At-Home Teeth Whitening: For at-home whitening, custom trays are prepared based on impressions taken from the mouth. Whitening gel in proportions recommended by the dentist is placed into these trays, and the trays are used for specified durations. The treatment period usually spans a few days, aiming for controlled whitening.

Combined Teeth Whitening: In the combined whitening method, in-office whitening performed in the clinic is supported by at-home tray applications. This method aims to achieve more lasting and effective results, especially in cases of severe discoloration.

Single Tooth (Internal) Whitening: This method, preferred for teeth that have darkened after root canal treatment, involves applying whitening material to the internal part of the tooth, and the tooth is sealed with a temporary filling. Sessions can be repeated at certain intervals until the desired color is achieved.

For all teeth whitening methods to be safe, effective, and permanent, it is of great importance that the procedures are planned and applied individually under the supervision of a dentist.

What are the Possible Side Effects of Teeth Whitening?

Teeth whitening is generally a safe aesthetic procedure when performed under the supervision of a dentist and with correct methods. However, as with all dental treatments, some individuals may experience temporary or rarely undesirable effects. The risk of side effects may increase, especially in individuals with existing oral and dental health problems.

• In individuals with untreated tooth decay, gum inflammation, or advanced periodontal disease, whitening gels can lead to irritation of the tooth enamel and increased tooth sensitivity. Therefore, it is important to perform an intraoral examination and address existing problems before the whitening procedure.
• The most common side effect is sensitivity to hot and cold after the procedure. This condition is mostly short-lived and subsides on its own.
• During pregnancy and breastfeeding, teeth whitening procedures are not recommended as a precaution due to insufficient clinical data.
• Similarly, since tooth nerve development is not complete, whitening applications in individuals under 16 years of age can increase the risk of sensitivity and pulpal irritation (a temporary irritation of the pulp, which consists of nerve and vascular tissue located inside the tooth, due to chemical, thermal, or mechanical factors).

To minimize side effects, teeth whitening procedures must be performed with appropriate products and concentrations, always with a dentist's evaluation.

What Should Be Paid Attention to After the Teeth Whitening Procedure?

To maintain the whiteness achieved after the teeth whitening procedure, it is recommended to avoid coffee, tea, cigarettes, and dark-colored foods that can cause tooth discoloration, especially during the first 24–48 hours. During this period, the increased sensitivity of tooth enamel to external factors can heighten the risk of discoloration. To preserve oral and dental health, it is important to brush teeth at least twice a day, not neglect flossing, and prefer non-abrasive toothpastes. Furthermore, adhering to the dentist's recommended care instructions and not skipping regular check-ups contributes to maintaining the effect of the whitening procedure for a longer period.