Hi, !
First off, I am so sorry you are dealing with dental pain. I have had three babies with no pain meds, but when my teeth start hurting? Well, send all the pain meds my way! I cannot handle dental pain.
Okay, enough about me. I am glad your dentist is working with you to try to get to the bottom of what's going on. I cannot diagnose you, for your safety. But, there are some dental/oral issues that can be linked to MS, including trigeminal neuralgia. You can read more about TMJ here -- https://multiplesclerosis.net/forums/trigeminal-neuralgia-experiences and here -- https://multiplesclerosis.net/living-with-ms/teeth-pain-symptom.
Also, I am a notorious nighttime jaw clencher and have worn a bite guard at night for decades (unfortunately, only after there was permanent damage done to my teeth). And it can lead to a jaw issue called temporomandibular joint disorder (TMJ). Has your dentist mentioned that you might be clenching your jaw or dealing with TMJ? You can read a bit about TMJ here -- https://multiplesclerosis.net/living-with-ms/jaws-tmj-bruxism-their-relation-to-ms-and-why-were-gonna-need-a-bigger-boat. Contacting your neuro might make sense, if you think this could be related to your MS and also just to keep him/her abreast of what's going on with you, healthwise. I do hope you and the dental specialists are able to help discover what's going on and offer you some possible treatment options!
Best, Erin, Team Member.