Review (2/5): Don't see any change on my teeth :(
I haven't seen any change and I've been using it for one week but I would say this. I like the fact that there is no aftertaste or smell to it but my gums are starting to hurt. I will give it a few more days and if I don't see any change to the trash it goes. The only warning is that you must use it at night because it will leave your teeth and gums somewhat gray/blackish color. I don't see my teeth polished or whiter.