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I have already used up my first box of Crest Whitestrips and bought another one to use when I see that my teeth are becoming discolored again. The only thing I noticed was that my gums, which are kind of sensitive already, became slightly sensitive during one or two of the applications. But other than that, the whitestrips really worked and my teeth are noticeably better.
Before I tried them, I didn't want to get it because it was a bit costly for something that I wasn't sure was going to even work. But there's coupons out there for the whitestrips. I only spent $18 on my second box because I found a coupon and they were already on sale.
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