Methamphetamine (informally referred to as "meth") is a stimulant drug with a high potential for addiction in its recreational users. It incurs physical and psychological side effects that users find desirable. Other side effects (like bruxism and stimulant psychosis) can result in users neglecting their dental health, eventually leading to advanced tooth decay (caries) and gum infections. Further, a common side effect of stimulant drugs is xerostomia, which accelerates tooth decay. , methamphetamine is the most discussed illegal drug in dental literature for its extensive effect on users' dental health. The teeth of some methamphetamine users appear to be dark and extensively eroded. The epithet<unk> " is the result of these superficial presentations of advanced tooth decay and gum infection. Caries often occur in the cervical regions of teeth, where the tooth surface narrows at the junction of the crown and the root; decay is primarily centered on the buccal (cheek) side of the teeth, and on tooth surfaces that are adjacent to incisors and canines. Eventually, the coronal tooth area (near the crown) can be affected by the decay and erosion. The dental caries of<unk>  often progress slowly, perhaps because their advancement is hindered by intermittent hygienic practices. The decay can lead to tooth fractures and severe pain. In some cases, teeth are permanently damaged and must be removed. Along with malnutrition and weight loss, the dental effects of methamphetamine use contribute to the appearance of premature aging seen in some users. Methamphetamine users sometimes experience soreness in the joint of the jaw and dental attrition (tooth wear) due to bruxism, a common side effect of stimulant drugs. This bruxism can occur continuously. Chronic use of the drug might also cause trismus, the inability to open the jaw. The effects of<unk>  are similar to those of Sjögren's syndrome, an autoimmune disease that causes a lack of saliva, which results in tooth decay.
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