I recently tried the Listerine White strips and have a mixed opioion about them. You have to do it twice a day for two weeks to supposedly see any results so that's what I did. I didn't like how they were individually wrapped, opening the package could be tricky and if you didn't open it just right then the stip would get ripped. They had pretty clear instructions on how to apply them. Ypu had to get them on right the first time because once they got wet there was no turning back. They were the dissolvable kind so you could just apply them and go. They also left your mouth feeling quite fresh and clean after being applied, they dissolved after probably 10-15 minutes. So after my two weeks I can't say that I actually saw a difference in the color of my teeth and the price of these whiteners out there, I guess I'm a cheap-o, but I most likely won't buy them again.