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One way I've found to train that habit is in yoga practice. One of my teachers would often say during particularly difficult or uncomfortable postures -- splits for example -- "use your legs not your jaw" and it was a great cue to realize you were holding tension there. Eventually you build the habit of checking in with it -- "am I clenching my jaw?" -- and it largely goes away with time and patience.

I've read somewhere that this is a mechanism to supress the signals sent by the tongue. The tongue is so sensitive that it can perturb our brain somehow, but once compressed it is only seen as noise, which the brain is then capable to ignore and concentrate on the actual task.

Interesting. Would there be another way to quiet these signals?

I do not know sorry. FYI it was taken from this source (French podcast), if you want to dig further (and somehow you find a way to translate it ;) )

https://ici.radio-canada.ca/ohdio/premiere/emissions/moteur-...

This probably not for You... but

For me, it took separating from my other half. The only ex{-,{girlfriend,wife}} I am not in contact with. It did wonders for my teeth-clenching.

Sucks.