A dying back molar (a too deep filling) caused me horrible havoc many years ago.

It was similar to TN pain. It fooled an oral surgeon, and my dentist. And finally I had an episode of "lock jaw" where the muscles seized up. The dentist sent me to a TMJ specialist, and he said nope.

So I had a root canal in that tooth and a crown finally. It was several years
of misdiagnosis, and agony...all for a tooth. So make sure you don't have
some hidden slow dying tooth nerve!

My doctor told me to use sour candies too. As my saliva is drying up as well.
It was worse at work, I am not having the "mumps" cheeks at home as much.
She said if the glands under your ears get hard/sore you need to suck on
some sour things to stimulate saliva. Otherwise risk a stone in there, which is
much worse to deal with! So I agree with Sue.... I do Jolly Ranchers, because they don't cut up my mouth like other candies do. Some of my medications,
dry me out (antihistamines and Levsin).