"The jaw compensates for everything from glutes to deep neck flexion to pelvic floor dysfunction to abdominal stability.
Watch a heavy lift or a dysfunctional breather, and you will watch them clench, shift, and move the jaw in attempts to gain stability.
The TMJ is the go-to compensator because of its developmental centers.
Motor control involves mobility, stability, strength, balance, and equilibrium relative to where you are in space, a concept known as proprioception. "
Read the whole article here. It's really enlightening.