I went to BriteSmile on my sister's recommendation. I liked the results, but I did feel that the treatments were a bit on the expensive side.
BriteSmile offers what they call "a revolutionary breakthrough in teeth whitening services". They use a light-activated gel and shine a light on your teeth which is supposed to lighten your teeth nine times brighter.
It takes about two hours total to have the treatment. I thought that when I finished my teeth would be a lot brighter after looking at the in-store brochures. So, I was a bit disappointed by the results.
Bottomline: Don't expect miracles, do expect slightly whiter teeth.