I have TN above and below my left eye and in the cornea from a fall where I broke a cheekbone on the other side of face. Believe me the pain is severe and it's been diagnosed as TN by neurologist. I already have a pain doctor, so he's treating it with meds. Like all pain syndromes, the sooner you get onto meds, the better the outcome. So don't delay.

Go to a good Optomologist (board certified doctor) not an optometrist in a selling glasses. You cud try ur local hospital. I found mine very helpful. She checked the eye pressure and the optic nerve and took pictures of the inside of my eye. Next week, she's doing more tests of the back of my eye for me, as well as checking that my sight hasn't changed and that I don't have any blind spots. At least then you know there's nothing wrong with your eye.

It sounds like the dental work may have triggered something.
CailinRua