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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 causes of TMJ dysfunction fall into two categories: tight muscles and damaged joints. Anything that causes the jaw muscles to tighten up can cause TMJ dysfunction, including stress and dental disease. Damage to the TMJ can result from trauma or disease such as arthritis. Less common causes of joint problems include fusion of bones or calcification of ligaments (ankylosis), looseness of the jaw caused by stretched ligaments, and birth abnormalities. Treatment is based on cause.