I wonder about other amphetamines. Because there's some things you can take turn into amphetamines when your body processes them, IIRC. There are also medications that are in the same family. I suspect that while people do usually tell their dentist what medications they're taking when prompted, some people are kind of flaky and forget, while other people might have a reason in their head not to. But, not everybody thinks to disclose stuff like "supplements" which are unregulated, variably legal, and could also pose a health risk if they qualify for this particular scenario. Good of them to tell people that though. I never knew that and I've gotten lots of dental work done, although, I've never done hard drugs.
Hell, they still prescribe meth in some instances. It's called Desoxyn. Adderall, a drug so commonly used right now there's a shortage (or was, very recently), is a strong amphetamine. They're used for a quite a lot medically, and all have similar effects on the body by definition.
The issue at play here is amphetamines are doing a number on vasoconstriction and heart contractility, which then boosts heart rate and BP. This increases the chance of all that fun stuff like ischemic/hemorrhagic stroke, heart attack, or a dangerous dysrhythmia. When you add in anesthesia that has similar effects (vasoconstriction), you massively increase the odds of a complication. Thats without considering the already existing damage likely present in those abusing drugs of this sort.
Not a lot of people realise that the lidocaine you get at the dentists also contains epinephrine to make it last long. Which can play merry hell with your blood pressure. I can't have epinephrine for other medical reasons besides the way it messes with your blood pressure and honestly I prefer it, I'm numb long enough to do the surgery and it's all gone in half an hour or so instead of a numb face for half the day.
Lidocaine and epi are an interesting combo. There is a lot of literature on where and when they can be used in conjunction and where they absolutely cannot be used together. Anesthesia is a very complex subject and super intriguing.