Dental erosion is a form of tooth wear – where enamel and then dentin is worn down. It is defined as irreversible damage to the teeth caused by chemicals (usually acids). This acid can come from outside sources (e.g., food and drink) or from inside the body. External sources of acids include fruits and fruit juices (particularly citrus), soft drinks, sports drinks, wine, and vinegar. Dental erosion is preventable. The use of a straw can help keep acidic drinks away from the teeth. Rinsing with mouthwash or water after eating can help neutralize the acid exposed to your teeth and gums.