Whitening toothpaste
Here's the rub: you rely on toothpaste for fresh breath and fighting cavities, and many are designed to make your pearly whites white again. But just because whitening toothpastes are available over the counter doesn't mean they're completely harmless. Long-term use of some of these toothpastes—especially grittier ones designed to scrub off stains—can wear away your enamel and increase sensitivity, says Clifton M. Carey, PhD, professor in the school of dental medicine at the University of Colorado Anschutz Medical Campus.
Stay safe: Look for whitening toothpastes with the American Dental Association's ADA Seal of Acceptance, which is an indication that they gently polish teeth to remove surface stains. If your teeth feel more sensitive after beginning a new whitening product, see your dentist.