I've been using these since like 2008
I started using these when I was a broke high school kid and have not found ANYTHING in stores I like more. Crest whitestrips and anything flimsy like those will slide off my teeth. These stay in place comfortably and never give me sensitivity. I use one box about twice a year to keep my teeth "you have the whitest teeth ever" kind of white.
Rating: 5 stars