it does dry out your oral/nasal cavity. It can cause your body to produce mucus to compensate. I commonly feel like swallowing is slow as if there is a thin layer of mucus lining my throat. Even had yellow mucus drip out of my nose as if it were a nose bleed (happened 3-4 occasions), which comes from having a sinus infection.
This is one of the reasons I switch to micro-dosing on an empty stomach and supplementing with coffee to limit exposure to amphetamines.
It's possible for it to lead to increased clenching/grinding of teeth.
With that said....a decent diet and doing all the things you're supposed to be doing anyway in terms of oral hygiene and you ought to be fine. It's not a "you're going to ruin your mouth", it's a "pay more attention to this".
Been taking Adderall XR for >10 years, no cavities or other dental concerns personally speaking.
Go ahead and take legal cocaine though, hope your post helps you sleep at night
Do you know their entire medical history? How severe the ADHD is? Any other issues they are treating or not treating? If you can point to a study to back up what you are saying then by all means go for it. Otherwise all you have is anecdotal evidence and pretty weak evidence at that.
I get a new pharmacist every time I fill a script and I never share one iota of my diagnoses with them, they just fill the Rx and advise on contraindications and unusual doses they see.
Can you see into a person's brain with your own 'two eyes' as well? A neuroscientist can actually see our neural activity with fMRI and other tools to study brain science unlike your pharmacist buddies and yourself talking to random customers for 5 minutes in a grocery store.