Teeth Whitening>Does any of it really work if it's not done by a dentist?

[English Milly Masseuse]

I was at a very well established hairdressers today and I was offered a "new revolutionary teeth whitening" something or other>>>>>>>woosh>>>>straight over my head since I was sold something similar last year from a big compny at a press fair that was total crap as well as being uncomfortable and nasty tasting.

I am not too bothered as a non smoker, but I would try something if recommended by a friend I guess.

Have any of you guys or gals gone for it? Or is it all a big rip off?

B x