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The Temporomandibular Joint. The TMJ, or temporomandibular joint, is the joint that connects the lower jaw to the skull. Actually, two temporomandibular joints are located just in front of the ears, one on each side of the jaw. The TMJ joint allows you to move your lower jaw so you can talk and chew.
The cause of TMJ disorders is not clear, but dentists believe it arises from problems with the muscles of the jaw or with the parts of the joint itself. Injury to the jaw, temporomandibular joint or muscles of the head and neck-such as from a heavy blow or whiplash-can cause TMJ disorders. Other possible causes include:1  Grinding or clenching the teeth, which puts a lot of pressure on the TMJ. 2  Dislocation of the soft cushion or disc between the ball and socket.njury to the jaw, temporomandibular joint or muscles of the head and neck-such as from a heavy blow or whiplash-can cause TMJ disorders.