I bought the Crest 3D White Whitestrips Advanced Vivid. It's a 14 day kit, but in the directions it says that, for faster results, you can use 2 a day for 7 days, instead of just 1 for each of the 14. I'm curious if you can use more than 2 per day?
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ideally no more than two weeks, and no more than the recommended, the reason is sensitivity and possible burns. If over use you can develop chemical burns, as well as sensitivity. some people I have encountered have bleach so much or too long or too often that they burnd their gums out and now have exposed roots which are naturally yellow and can not be lighten with whitener.
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