TMJ treatment using the Tend Focus The temporomandibular joint (TMJ) connects the skull to the mandible. The TMJs facilitate a range of movements of the lower jaw namely depression/elevation, lateral deviation (left or right), and protraction/retraction. What Causes TMJ Pain? Repetitive stress on the jaw, such as repeated heavy biting Osteoarthritis of the TMJ. Yes, the TMJ can suffer with osteoarthritis like many other joints Grinding your teeth at night Dental problems with the teeth Stress (c