system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does methamphetamine use ruin your teeth?

I've been watching Orange is the New Black with my mom, and resident redneck Pensatucky's teeth made us both wonder why meth destroys your teeth so much.
gpt
It causes your mouth to be very dry due to reducing the production of saliva. Saliva helps keep your mouth cleaner and flush away sugars, acids and food particles. Without it, decay can happen much more easily.

Amphetamines can cause or worsen teeth grinding also, which may play a part. People on days long meth benders also tend to forget about insignificant matters like brushing their teeth and often favor lots of sugary and acidic drinks rather than actual food.

It's all a perfect storm for tooth decay.