Melanie - i was at the dentist on Saturday and she suggested this treatment for me as well. She said it would cost $300 and that i could probably get some back as well. The one she suggested for me is called Pola. Is this what you had done? She also said that it won't make my teeth a brilliant white or anything, but that they will appear whiter when the light reflects off them.
the other option (which she said was for extreme cases - or superstars lol) is the porcelain veneers which cost about $600 per tooth.