Tooth whiteners essentially bleach your teeth, and that has pros and cons
from The Washington Post via The Gazette
Walk down the toothpaste aisle at your typical drugstore, and you'll see a range of products to whiten your teeth. Whitening toothpaste, whitening strips, a whitening gel you can paint on your teeth with a cotton swab or use in a mouth tray, a two-step "daily cleaning and whitening system" and more. The drugstore products all have essentially the same whitening ingredient - the bleaching agent peroxide. If you go to your dentist for a professional tooth whitening, they'll use a more concentrated peroxide product.
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