Methamphetamine
"Meth Mouth" is a term used to describe destroyed or decayed teeth in people that use methamphetamine. Meth mouth can happen very quickly. A new addict can go from having healthy teeth to losing all of their teeth in as little as one year. The decay (rotting teeth) is not caused by methamphetamine itself, but by users not brushing their teeth, having a lot of sugary drinks, and having dry mouth.