I have had dental work done. They just used local anesthesia and I didn't have any problems. Except that I am terrified of dentists.........

I am sure that I already had MG when I was sedated for a routine colonoscopy (fun, fun ) even though I was not yet diagnosed, and didn't and it didn't cause any problems.

I would just be sure that the person in charge of sedation is aware that they really, really have to monitor your breathing. Somebody needs to watch you until you are up and around. You should be fine.