Some patients are dissatisfied with the color of their teeth, perhaps from staining caused by the use of tobacco, coffee and other beverages and foods. Discoloration also can be the result of aging, injury, excessive fluoride, certain illnesses and the use of tetracycline, an antibiotic, in early childhood. Bleaching can remove many discolorations and stains, but some are harder to remove than others.

The procedure takes from 30 minutes to one hour in the dental office, and teeth can become slightly sensitive just after the treatment. Bleaching features a chemical solution that is painted on the teeth, and a special light often is used at five minute intervals to help activate the solution, which is an oxidizing agent. Patients also can have their teeth whitened at home in a procedure called night guard bleaching. This approach involves a custom-fitted mouth guard that holds a bleaching gel in close contact with the teeth and is worn about two hours daily, day or night, for about two weeks, although the amount of time and the duration of the treatment can vary depending on individual needs.

The ADA does not recommend over-the-counter tooth bleaching products that are self-administered. Although such products may cost less, bleaching should be done only under the supervision of a dentist after an oral examination and diagnosis of the discolored teeth. Some people with certain dental conditions may not be good candidates for bleaching, such as patients with gum recession that has left sensitive tooth roots exposed.

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