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A member asked:
How long should can i leave 36% carbamide peroxide on my teeth?
A doctor has provided 1 answer
About 1 hour: Most whitening materials will lose most of their potency after about an hour. Some people think that they can leave it on for hours and it will continue to work but that isn't true. It is a chemical reaction that has an end.
Answered 2/13/2013
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