I love these! Compared to the other white strips in the Crest line, these are much easier to adhere to my teeth and stay in place. They sort of feel like heavy duty stickers but they do not hurt to remove and are easy to get off the clear wrapper that holds them. I can precisely put them on the teeth that I want to whiten, let them sit, and remove them without any weird gunk or sticky mess. I am always left with white teeth! Besides the fact that these strips whiten my teeth, another awesome part about them is I have never felt any tooth sensitivity or gum pain. With other whiteners I've used in the past during the whitening process my gums will burn, but not with these. I always give tens to products I use because they really do work, and this one delivers! I expect teeth whiteners to be expensive but with all the great coupons Crest has I always catch a good deal. I will always purchase these because they really make my teeth white and I never have any tooth/gum sensitivity. Yay!