Are over -the- counter tooth-whitening strips Safe? There must be something very strong in them if they bleach your teeth after only a few uses. Can that be dangerous?
-Joanne Day.
Burnaby, B.C.

A: Whitening Strips are relatively safe and are more effective than whitening toothpastes. The main ingredient is hydrogen peroxide, which acts to remove stains from the outer surface of the teeth. Whitening strips are not for everyone.
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