Periodically patients report the skin in their mouths peeling off in thin layers. Most people become aware of this because their tongue picks up a stringy substance when the tongue is rubbed around the inside of the mouth. Less commonly the layers peeling off may be deeper and involve nerves (pain) and capillaries (bleeding). Most of the time this occurrence is related to a chemical or food sensitivity. If this happens to you, try changing your toothpaste, mouthwash or any other substance you use regularly in your mouth. Some anti-tartar and whitening agents in oral health care products may cause skin sloughing in some people. If the problem persists, your dentist can help you identify and treat the problem.