It’s almost 100% neglect. *almost*
But meth is also super acidic. It isn’t so horrible on teeth, but it’s really bad for you gums, and keeps you from salivating properly, so your dry ass mouth and whack ass gums stay dry and dirty and acid soaked and combined with the neglect, leads to what we call meth mouth. Once the gums are receding and the teeth are eaten by bacteria (usually regularly washed away with saliva then teeth brushing), they get super fragile and can break from grinding or even just chewing.
People who don’t understand acidity or dental care will tell you that it’s not bad for your teeth at all and neglect is the ONLY reason, but neglect alone does not result in the rapid deterioration you get from meth use, and even short term use and staying on top of daily brushing can still do a real number on your teeth for the rest of your life.
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