Crest Whitestrips Dental Whitening formula 56 Strips, 14 Day Treatment Review

I have regularly used Crest Whitestrips for the past few years now while giving the cold shoulder to other newer teeth whitening products. Why? I'm not so sure. I think because I actually see a difference using Crest Whitestrips. In fact the only downfall I find with this product is that I tend to have whiter upper teeth than lower teeth. The strip just won't stay put! I don't talk, laugh, smile, curse at anyone, perform personal monologues, nor even recite popular quotes from Spaceballs while I am wearing these strips, but the bottom strip invariably ends up halfway down my throat before the suggesting wearing time has passed. So....I end up with business on top and party on the bottom. Sigh. As long as I don't smile too wide, it isn't a problem.