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i've used crest whitestrips before, and my teeth were only sensitive for the first two days. to be honest ive never tried the generic shoppers brand but if u look at the ingredients list and it is identical, then you'll be getting the exact same thing as crest exept ure not paying for the "CREST" logo stamped on the box. my friend tried the generic brand before and her results looked just as good as mine. i used the crest one when it first came out, which at that time only had the 14 day treatment and a few years later, my teeth are still quite white. however they arrre beginning to yellow by now (5/6 yrs) so im thinking of tounching them up again. probably gna try the 3 day treatment one by crest =]
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