Review (3/5): They work but...
The crest white strips do work but the problem I have is I cannot get the strips to stay on!!! I try not to move my mouth and tongue much, but you have to have some movement, and when I do, the strips move around and that nasty gel gets in my mouth yuck!!! I wish crest would make some sort of tray that would hold the strips against your teeth better. Other than that, they really do work.