I have purchased the product in hopes of what is here is wrong, or thought I'd better listen to those who do good rate. That was stupid. After the first application you can see something, but unfortunately nothing good. I've done everything as described: Tidy teeth cleaned, dried over teeth thoroughly and then it stuck the strips. Well, they taste something disgusting and it produced quite a lot of spit, but should not interfere further. Then I obediently waited an hour and wanted to settle it. Already the place turned out to be difficult because the parts as anything sticking to the teeth. Then the first shock: White spots. I thought that the intended are remains and after brushing go away, but no. Now I have completely stained teeth. Great. Moreover, nowhere is it what ingredients has the product that gives me something to think about. The teeth did hurt a bit and the gums too.