My TENS unit instructions said to not use it on the head. Don't know why though.

I used it on my neck for the horrible pain and tightness I get with my migraines this past week. I've used it before, but sometimes I put it away and totally forget about it

I have TMJ too and was thinking it would be good for my jaw.

Now that I finally have insurance again and can go to the doctor I plan to ask them about it.