Hi dbrow
My never was snapped in accident when I broke my jaw.
It will not regrow or anything I have plates on each side of lower jaw. I had burning tongue for almost 2 years off and on .
I have a Neuro stim implanted for my pain. I do not have burning tongue since implant and can control my pain pretty well but I have my days and weeks. I am not pain free but at a lower level most times .

Wishing low pain and positive thoughts to you.
Let us know how things go and if you get any info on what might be the cause ,what the doc say .
Oh have you seen a Neruo ? Any one with T.N. should be seen by a Neuro . Keep hanging in there you will find answers soon.
PEACE
BMW