The growing use of methamphetamine is believed to be the cause of the rising incidence rate of 'Meth Mouth'. 'Meth Mouth' is a condition that involves chronic tooth decay and rot, and eventually severe tooth loss.
'Meth Mouth' seems to be the result of several factors including the chemicals from which methamphetamine can be made, the loss of saliva - which is vital for controlling bacteria in the mouth and maintaining a safe ph level - and grinding teeth.
The rising incidence rate of 'Meth Mouth' is particularly visible in prison populations which have a growing number of inmates who have or had methamphetamine habits. One such inmate, Bryan Rodgers, made sure to brush regularly, but has lost 3 teeth.