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Re-activateAmericans have been snapping up at-home tooth-whitening kits; in 2008 consumers spent $343 million on them. The products can help somewhat, our recent tests show. But can a person use tooth-whitener strips or trays too often?
Maybe so, according to the American Dental Association. It says that if used improperly, the chemicals in the products might damage your gums and teeth. Indeed, some of our testers complained of irritation or other discomfort while using them. The ADA also worries that unsupervised use might mask an undiagnosed medical condition, such as celiac disease, which can cause tooth discoloration. And the long-term safety of tooth whiteners is still unknown, especially for those containing a high concentration of hydrogen peroxide, the bleaching agent.
In 2008 the European Scientific Committee on Consumer Products recommended that home toothbleaching products contain no more than 6 percent hydrogen peroxide. But none of the eight whiteners we tested disclosed the peroxide percentage.
Bottom line: With so much still unknown, we think you should use tooth whiteners cautiously, probably no more than about twice a year. And don't use whiteners if front teeth have caps, crowns, dentures, veneers, or white fillings. Whiteners work only on natural teeth. Your best bet is to prevent stains in the first place. Go easy on coffee, tea, and red wine; don't smoke; and brush your teeth after meals. Soft drinks—colas as well as clear sodas—can also contribute to staining by eroding tooth enamel.
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