It's been a while since I've visited this thread. I get face and head symptoms. The nerve firing as suggested come from the trigeminal nerve area. Dental treatment triggers a flare as does migraine. On my blog I have much about safe dental treatment. The RSD Hope website has protocols to be followed when having dental work. I have a cream applied, then a needle and at the end of treatment another needle. This prevents a problem. It's called preemptive analgesia. Please gogle Professor Scott Reuben "preventing CRPS?RSD post dental or surgery".

I have successfully treated trigeminal and other one sided flare ups in the face with mirror therapy. I use a twin makeup mirror. There's a photo and description on my blog
http://crps-rsd-a-better-life.blogspot.com/
crps/rsd a better life

Go tot he left and click on the "dental" tag.

jeisea