What are the symptoms of meth mouth?

Multiple: Symptoms are characterized by severe decay and loss of teeth, as well as fracture, enamel erosion, and other oral problems symptomatic of extended use of the drug. Dry mouth (xerostomia), bruxism (tooth grinding), poor nutrition and poor dental hygiene contribute to this destructive pattern.

Lots of decay: Cavities that appear rapidly, lots of breakdown structurally.

Severe decay: often you will see black spots around the teeth as well. Its pretty obvious when you see it (and really gross!).