Meth mouth is a dental condition characterized by severe decay and loss of teeth, as well as fracture, enamel erosion, and other oral problems symptomatic of extended use of the drug methamphetamine. The specific cause of the condition is unknown, although "dry mouth" and bruxism ( teeth grinding) are involved. Other frequently cited factors are poor nutrition, eating too much sugar, and lack of dental hygiene, common among long-term users of the drug. Treating meth-mouth is difficult, and it can be medically dangerous for active meth users because of the cardiac problems that can result from the interaction of local anesthetic with the drug. To treat patients with the condition, dentists prescribe fluoride to fight tooth decay and drugs that increase saliva for dry mouth: they also educate patients about nutrition and dental hygiene.
Some users describe their teeth as "blackened, stained, rotted, crumbling, or falling apart". Often, the teeth cannot be salvaged and must be removed. The extensive tooth decay is likely caused by a combination of drug-induced psychological and physiological changes resulting in dry mouth and long periods of poor hygiene.
Dr. James L. Johnson