Annie can correct me if I'm wrong, but when you go to your dentist, be sure to tell them that you are taking Mestinon and you are being treated for MG. A good dentist should take that into account and be able to make treatment decisions that will help you get through the appointment better, and also pick medications that will work better for you during the appointment. If you need to take a break to rest your jaw, for instance, let the dentist know. If you know you have weakness in your face, tongue, and jaw, tell the dentist in advance so that they will know to let you rest periodically. They can work that out. Sometimes it helps to close your mouth for a bit, and get a break from holding it open the whole time.

Take care,
Erin

PS It is a good practice to bring a list of current medications to your dentist appointment, too.