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. Internal acidic sources include stomach acids (think acid reflux and other gastric disorders), as well as frequent vomiting. Dental erosion is preventable. Rinsing with a natural mouthwash or water after eating can help neutralize the acid exposed to your teeth and gums.