This is simply a cosmetic treatment to restore whiteness to stained teeth, and is much more effective than using a 'whitening toothpaste'. We tailor each treatment to the individual as we will take an impression of both your upper and lower sets of teeth, and make plastic guards that fit you exactly. Then when it suits you, you can place a small amount of bleach inside these and simply leave it in while you work, sleep or watch TV- the only thing you can't do is eat! A course of bleach also depends on the individual and the existing colour of your teeth and can last from 3 days to a month or more.