Does meth affect teeth

No it does not. It would be nice if you could be a little more specific. Are you talking about meth mouth? If so it can happen, but is preventable. The only reason it happen is because of the lack of moisture. Ever heard of cotton mouth? Well Amphetamines can cause dryness of the mouth, but not all the time. Chewing on sugarless gum or staying hydrated can prevent meth mouth. Throat damage from meth? Never heard of such a thing.