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1.
The stripping of enamel from the teeth, caused by prolonged meth smoking. The teeth, lacking enamel, then rot at a much faster rate, often turning black and infecting the gums.

Also known as "meth mouth"
K: Yeah the guy's mouth was rotten like he had meth jaw.

A: Meth mouth?

K: Why yes, meth jaw and meth mouth are synonymous.
by zychster March 02, 2011