RDH here. There are MANY reasons meth is harmful to teeth, but I’ll list 3. Often times there’re acidic ingredients in meth (street meth that is, not the pure compound), which leads to weakened enamel and cavities. In addition, meth causes dry mouth, which creates a more hospitable environment for cavities to happen. Also, people who use meth tend to neglect their oral hygiene (and often drink Mountain Dew and energy drinks – not sure why this is), which sets them up for… cavities. The typical “meth mouth” is just a mouth full of erosion (acid wear and teeth grinding) and cavities.
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