Dextroamphetamine is a common first line treatment for ADHD, but methamphetamine is a second line treatment. A lot of the information about methamphetamine is,

Dextroamphetamine is a common first line treatment for ADHD, but methamphetamine is a second line treatment. A lot of the information about methamphetamine is, bluntly, propaganda. For example, there seems to be nothing about methamphetamine that is uniquely harmful to teeth, but "meth mouth" is a common trope. When taken orally at therapeutic doses it's not clear methamphetamine is any more harmful than dextroamphetamine, but it's certainly possibly it has more scope for abuse. It's certainly dangerous at high doses! Unfortunately it's hard to find hard data and not drug war propaganda.