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Elevated heart rate and blood pressure, pupil dilation, vasoconstriction or constriction of the arterial walls, and increased blood sugar levels are just a few of the harmful effects of crystal meth abuse. These, however, do not show up in an addict's face. What does, however, are ugly scars that are difficult to reverse. Then there's the problem of losing teeth, which happens in a user abnormally quickly.

Source: Multnomah County Sheriff's Office