Have purchase tooth bleach system (23% carbamide peroxide & bite/boil mouthguards). Have used for approx. 15 hours over two weeks and all that seems to happen is teeth looked 'cracked' (which on a website is normal) and teeth are very white inbetween teeth right at the sides. They don't seem to be bleaching 'everywhere.' Now, does anyone know if this is what happens initially and gradually, will the whole tooth bleach? I've not noticed ANY difference see in the last say 6 hours of bleaching.
the best way to go about tooth whitening these days is to have them lasered, depending on how much you wish to spend. Or dentists are doing a tooth bleaching process where they take a mould of your mouth etc, which is cheaper than laser, it costs about �200. Not too sure about the home kits though i'm afraid.