I would challenge even this framing. Amphetamines were widely used and abused between the 1940s and 1960s without social stigma. They are for sure a problematic class of chemicals, but I think the perception that they are uniquely dangerous is tied up in their present association with societal out groups, classism, and disdain for the rural poor, whereas cannabis has become accepted among the upper class.
You could make some arguments about relative health effects, but those just as easily apply to alcohol which we readily accept and consume in polite company.
In addition to classism, one of the consequences of the war on drugs is there's not much trustworthy data on drugs' relative impact. Nobody wants to teach high schoolers there are any safe drugs.
So I know people who smoke and drink without obviously destroying their lives. But if you asked me to rank those alongside meth, cocaine and chainsaw juggling for danger I've got nothing but guesswork.
OK I'm gonna challenge you on that. Amphetamine causes (even at low and occasional doses) insomnia, mania, extreme loss of appetite. When used for longer periods, it can cause disordered thinking, delusions, paranoia, invasion of Russia..
We already does millions of people in America at least with Adderall which is an amphetamines not molecularly very different from Methamphetamine. It turns out to be mostly safe for most people, whether it good for you or me to use is a different question.
Also linking amphetamines to Nazis in order to demonize users is just ridiculous.
The primary mechanism for "meth mouth" and similar oral health issues are dry mouth and teeth clenching which can be caused by a number of stimulants including caffeine(at moderate to high doses of ~6 cups of coffee). The remedy for which seems to be drinking a lot of water.
That said, it's obviously bad to give children diet drugs but that has no real bearing on how we treat recreational drug users who are adults.
You could make some arguments about relative health effects, but those just as easily apply to alcohol which we readily accept and consume in polite company.