Teeth whitening at the dentist's begins by removing any tartar and plaque from your teeth.
After that, the professional whitening product is applied directly to the teeth. Then light (most commonly used these days) is applied to the product, causing the decomposition of hydrogen peroxide contained in the whitening gel. This decomposition releases the oxygen that passes through the enamel and dentin, where it changes the color of the tooth, but not damaging any part of the tooth. The results can be seen in only one, 30-minute treatment. Usually, however, several appointments are needed to achieve the desired results, as recommended by the dentist. There are other, less effective methods of teeth whitening, some of which can be performed at home, and your dentist can also help you with a recommendation.