I recommend AT.
There are mouth guards for your front teeth. It is uncomfortable to clench the front teeth together, and thus the guards make you aware of grinding/biting.
Without hesitation, he said to focus on learning to play with relaxation and flexibility. In his experience, far too many of the brilliant young violinists he was working with had a level of tension that was blighting their artistic potential and increasing their risk of injury.
So when I'm practising I have a simple routine. First I focus on learning to play the phrase I am studying, concentrating on the sound and technique. Then I focus on playing it with a relaxed left hand. Then with a relaxed right hand. Then with a relaxed tongue, jaw, neck, shoulders and diaphragm.
It's vanishingly unlikely that your jaw will be your only source of tension. Everything is interconnected, so you need to aim for whole-body fluidity.
I continue to cycle my attention around those four elements throughout my practice.
I only consider the passage learned if I can play it with a sense of ease.
Much, much easier said than done of course, but at least I'm making gradual progress...
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Not trying to be facetious. The first step to resolving tension is awareness. Stop every five or ten minutes and let your tongue drop (many people unconsciously press their tongues against the front of their mouths behind their front teeth). Let your jaw drop. Roll your shoulders. Etc.
I suspect you are playing with a lot of excess tension elsewhere in your body as well. Try practicing with left-hand whistles (barely touching strings, sounds awful) and then add *just* enough weight to your left hand fingers to make the notes clear.
Good luck!