Mine started pre dental work. I was having a nagging pain on the upper left premolar area. Waited it out, dentist changed a filling that did not help. Saw an endodontist who was not quick to act, sent home to wait and see.. after 4 weeks with no improvement we root canaled the suspect tooth. Did not help waited another 3 months and pain was worse so did the neighboring tooth to no avail. Considered pulling but keep going back and fourth on it. Doctors don't recommend.

Orofacial pain doc thinks its nerves however I have large fillings all over the place. My pain was in the gum area but also shoots up above the tooth near the root pain can be very very bad. I am just trying to live with it but not 100% certain on the diagnosis of AO. It still might be a micro fracture.