Just a little story:
My DD is getting teeth out at the oral surgeon. When I scheduled it, I told them about her PA and latex allergy. I wrote it on her form. Then when the assistant was asking questions about her past history of asthma as she was about to start working on her, I asked if she knew about her allergies. She said, "What?? You have a peanut allergy? You should write that on the form! I just ate peanuts." I told her I did write it on the form.
She got someone else to work on her.
Oh wow. That is such a scary situation.
Yeah, with DS' mouth stuff, it's something I really worry about.