The ADA council on Scientific Affairs has monitored the increasing numbers of whitening products. Whitening is, in a nut shell, any process that makes your teeth appear whiter. When a product bleaches your tooth, it actually changes the natural color of your tooth. Bleaching products contain peroxide which helps remove the deeper stains as well as the surface stains. You should note that non-bleaching products will only remove surface stains by using physical or chemical action. The ADA recommends you consult with a dentist before choosing a bleaching product. The ADA additionally advises you to consult with a dentist to choose the right treatment for you. This is important for people with many fillings, crowns, and very dark stains.