yes these really workbut keep a few things in mind [SEP] after very minimal and barely noticeable success with whitening toothpastes and gels i finally decided to give crest premium whitestrips a try previously i had found the cost to be prohibitive but the fact that or coupons are offered in our sunday paper with some regularity made the price a bit easier to swallowjust like the commercials say i definitely did begin to see some improvement after about three days i would describe the effect as more of a lightening than a whitening per se i could not detect anything while wearing them and after taking them off i thought that the gooey paste left behind was virtually tasteless i did experience some sensitivity in a lower tooth which i had capped over years ago although this sensation went away in time it was uncomforable enough to make me cut the lower strip to fit around this particular toothin summary i did see clear although not miraculous results from this product and i would be willing to try the strips again especially if the price were to come down a bit ultimately i would rate crest whitestrips three and a half stars as there is definitely room for improvement