I am investigating my problem, no root canals or anything triggered it, just a filling. Have you looked up Trigeminal Neuralgia?
It may not be a dental problem at all, but a nerve problem.
See your medical doctor and perhaps get a referal to a neurologist.
I have a similar situation right now, but when i went back to the dentist & tell them it still hurts, they tell me its the tooth next to it. the 1st tooth i did was #18, then they did #17 & now they telling me its another tooth... is it because i am paying cash for everything that they just like to do all the teeth?? or maybe they just didnt do the job right. I dont know...
i had a similar situation, and unfortunatley for me all the docs/dentists gave me was vicodan, which i took for a year and have now been clean for over a month. I was told i had TMJ... I was never the same after that horrible root canal (next to last molor, upper left side), i wound up having the tooth pulled because when they were ready to put the crown or bridge i was still in pain, i went to yet another dentist who told me the tooth might have been fractured. so to an oral surgen i went, he pulled the tooth, they gave me a bridge, i've been in pain ever since. Is it TMJ or not, I had an MRI, said yes TMJ, nothing anyone can do, have the night/day guard, etc. The pain is much better since i've stopped taking pain pills... When my allergies act up or i get a "monthly" migraine, I feel the TMJ.. they also said i have arthritis in my jaw because of the TMJ, i'm convinced that the dentist who took over 3 months to do the root canal ruined me..
Good Luck
gina