Higher concentrations of hydrogen peroxide, a bleaching agent used in many whiteners, can be delivered in a dentist’s office, so those procedures tend to be quicker than drugstore aids. But tooth sensitivity and gum irritation can occur, and the higher the concentration of the peroxide used, the more severe these side effects are likely to be.

More aggressive treatment isn’t necessarily more efficacious, either. A randomized trial of 90 patients found that use of a home bleaching tray with a 10 percent carbamide peroxide gel for two weeks offered the same degree of whitening as two in-office sessions using 35 percent hydrogen peroxide with light, which some dentists use because it supposedly activates bleaching agents.

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