So far I have been in constant pain for almost exactly 3 years, and at 27 years old I suspect I could be in pain for up to 50 more years, so my goal is to keep something that works going for 5-10 years and pray that they develope a new thing that works before that one stops. I am in for the long haul, so tollerances are a real concern. 
I have excellent result with otc capsician creme
After using it several days burning will go away.
First thing I do when I wake up is to apply this cream
On my gum and teeth and I can go all day without pain.
It has been the best treatment that I have used in the past 4 years.
I carry peppermint oil and apply it immediately when pain starts if it ever does later.
You have to learn how to deal with this cream.
Use glove to apply. I also use quitip to put in my ear
And this works very well. When putting in mouth, I put some tissue to try keep off tongue and mouth.
Don’t get if in your eyes. It will burn a lot. That why I will use a different finger if the glove each time.
I also take DOXEPIN 25 mg 3 times a day and this help too.
It is a tricyclic antidepressant.
I hate anti seizure drug side effects and withdrawals.
After trying 3, I refuse to take any of these drugs.
I was using otc lilocaine but I have found that I am not using it at all the past month since I started using capsician on gums,tooth,and inner ear.
But it has help me in the past.
I also use chloraseptic throat spray for sore throat
when my atn pain is in the throat so far only on one side,
and it works very well!