I used Crest WhiteStrips about 7 months ago, and now I want my teeth whiter again so I want to use them again. Is 7 months in between enough time to use them again? How often is it safe to use teeth-whitening strips?
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The kits say they can be used every 6th months. Dont do them every sixth months though because they are damaging. They work by breaking down the outter layer of your teeth which can make them sensitive to temperature and cavities.
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