It really works! They stick to my teeth without moving and the whitening is noticeable. I use them 1 1/2 hours at a time. They produce some saliva that I have to spit out about every 15 minutes, but it doesn't really matter. For that reason, however, I wouldn't want to sleep in it (as some say in their reviews). I've used them and been satisfied and later tried charcoal bleach powder because I was curious if it worked. Found the powder uncomfortable and went back to the Sheer White strips.
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