TMJ stands for temporomandibular joint, which connects the jawbone to the skull. The temporomandibular joint is a complex joint that allows you to move your jaw up and down, side to side, and forward and backward. The joint is composed of the temporal bone of the skull and the mandible or jawbone.
TMJ disorders (TMD) are a group of conditions that cause pain and dysfunction in the jaw joint and the muscles that control jaw movement. These disorders can be caused by several factors, including injury to the jaw, teeth grinding or clenching, stress, arthritis, or misalignment of the teeth or jaw.