Originally posted by: trmiv
I've used Rembrandt Extra Whitening for Canker Sore Sufferers for over two years now. I don't really think it's done much at all, if anything. Of course, I use it because it GREATLY reduces my canker sore problem, and not for the whitening, so I don't really care. It has worked wonders for reducing my canker sores though.
Originally posted by: gopunk
i use the colgate one, and it makes a small difference, so i think they (at least that one) works.