Review (5/5): Good product, satisfied customer :)
The Crest Whitestrips Classic work very well, Whithin 5 days of regular usage (2 30-minute sessions/day) I had noticeably whiter teeth, and my teeth weren't yellow before, but after you use this you'll notice the difference ;)
As to the pain complaints, there is indeed a small discomfort in the beginning, but it's no big deal for me, and after the 5th day, there is absolutely no more pain, nothing at all.
And if you put the strips on your wet teeth, they indeed don't stick well at all, but if you dry your teeth beforehand, the strips stay on very well, I can talk almost normally and they don't come off.
Highly recommended!