Could be all of the above? I do that all the time and mine is anxiety/Tmj related. Have you always had this?
Anxiety/Stress response.. I don't grind my teeth. But if I don't have something to chew on I'll grit myself into a migraine.
Try the tip of the tongue at the roof of the mouth. My chriopractor suggested this for my clenching. That keeps the jaw in a relaxed position.
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