What is the definition or description of: meth mouth?

Destroys teeth. "meth mouth" is an informal name for advanced tooth decay attributed to heavy methamphetamine use. It leaves users' teeth black-stained, rotted and often unsalvageable. Using meth will destroy your teeth, you and your life.
Serious Problem. Severe decay and loss of teeth, as well as fracture, enamel erosion, and other oral problems symptomatic of extended use of the drug methamphetamine. Reference sites: 1) http://en.Wikipedia.Org/wiki/meth_mouth 2) http://www.Youtube.Com/watch?V=j5sxjgrjity.
Black cavity smile. Meth mouth is characterized by large black cavities at the gum line of the front teeth. The cavities get large rapidly and often do not hurt until it is to late to fix them. The pattern of decayed teeth, the dry mouth, and the black cavities are often associated with the use of meth.
Your worst nightmare. One of the ingredients of crystal meth is gasoline or turpentine to 'cook' the drug and give it potency. That ingredient will literally eat away at your enamel and your life. Most users are too high to even care about the damage that they've inflicted upon themselves or they're teeth. Meth destroys lives. If you have used it- stop. If you're thinking of trying it- don't!