Methamphetamine, also known simply as "meth," is a strong stimulant street drug that's highly addictive. The use of methamphetamines can cause serious health issues, including severe and highly visible problems with the mouth and teeth. In fact, the association between methamphetamine use and dental disease has become so popularized in media that it's been given its own epithet: "meth mouth." What Is Meth Mouth? “Meth mouth” is a term used to describe the visible effects of oral disease in a person who uses methamphetamine because of the rampant tooth decay that often occurs with the drug's use. People who use methamphetamine may have blackened, stained, broken, or rotting teeth both as a result of side effects of the drug itself and …