Meth Mouth is a symptom of chronic meth usage. Meth Mouth is the condition where methamphetamine addicts and users start losing their teeth abnormally very quickly. However, this effect is not caused by any corrosive effects of the meth drug itself, which is a common myth.

Meth Mouth is caused by a combination of drug-induced psychological and physiological changes resulting in dry mouth, extended periods of poor oral hygiene, frequent consumption of high-calorie, carbonated beverages and bruxism (teeth grinding and clenching).