rampant caries and methamphetamine use 

Can anyone add some explanation to the section that mentions methamphetamine use as a cause of rampant caries? I found that an interesting correlation, but there is nothing to explain the mechanism in the article. Presumably someone familiar with the issue could add a sentence or two to clarify it. Otherwise this is a very good article and the pictures alone might scare some children into brushing their teeth (along the lines of the Simpsons’ “Big Book of British Smiles”). -