Have been using for a month and I havent noticed much difference, I have naturally yellow stain-free teeth. I have asked 3 different dentists and they said my enamel is naturally yellower. which is annoying because I really want them pearly whites!!!
I like how the toothpaste feels clean and has that same weird heating sensation you get from the chemicals the dentist uses :)
My partner has been using it and his teeth are whiter!
I really like this and think it does a pretty reasonable job of whitening. We are on our second tube of paste (hubby uses it too) and two friends commented recently that our teeth look whiter, so it must be working (it's hard to notice the difference on yourself when you look in the mirror frequently). I love the taste of this - and how it leaves my breath (!) and it does a good job of cleaning. I'll be buying it again.