It's actually not that harmfull. If you don't have that much to whiten to begin with, it's a cheaper way to get your teeth a bit whiter. It's just like anything else, don't over do it. Follow the directions, and then leave your teeth alone. If you want better results, then you should go to a dentist.
Answered by
satya
, an ibibo Master,
at
5:18 PM on December 18, 2007