it can be an award profitable process, which employs 16% carbamide peroxide gel, for up to six months, and ensures that teeth will get to VITA shade B1 ( the whitest natural shade ). A summary by Mudge (1967, p. 112 https://andrewautc648396.digitollblog.com/27891202/how-much-you-need-to-expect-you-ll-pay-for-a-good-coulsdon-teeth-whitening