Stains may
have an effect on the inside the tooth, also and are called natural stains. Before teeth are whitened, cavities need to be treated as the solution used to bleach teeth can penetrate tooth rot and reach the inner areas of the 
tooth. Tooth lightening works best that have been stained by food, drinks or age.
Over the counter teeth bleaching products sold in drug stores aren't generally recommended by your cosmetic dentist because they will be able to produce unnatural-looking results, and the store-bought trays may not fit correctly. Lightening can be done at home or in your dentist's office. For lightening done at work, the dentist will sometimes take pictures of them making it simpler for him to watch the way in which the process is going for you. Lightening at home often takes 2 to 3 weeks.
