Because having whiter teeth has now become the number one aesthetic concern of most patients, there are a number of ways to whiten teeth.  Whitening of teeth can be done with in-office treatment or take home kits. Both will remove surface stains from teeth enamel. Much like how you bleach stains from clothes, there is no damage to the enamel. Teeth whitening only affects enamel, so fillings, crowns and veneers may have to be changed afterwards. Teeth whitening is not permanent as stains on teeth can come back due to certain foods and beverages.