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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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