METH MOUTH

Methamphetamine users are prone to dental problems produced by a combination of factors: failure to attend to oral hygiene; the drug is quite caustic; drug induced clenching of the jaw; and sweet drink craving (often slaked with acidic carbonated drinks) resulting from drug induced mouth dryness.

Yep, amphetamines will wipe that smile right off your face. Gimme a big kiss, baby.

Update: Meth mouth the video.