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The temporo-mandibular joint or TMJ for short is the joint that connects your lower jaw to your upper jaw, it is the joint that moves when you speak, clench or unclench and of course, when you eat. It is one of the most used joint sin your body. Open your mouth and put your finger right in front of your ear. Now close your mouth. You should have felt the temporo-mandibular joint opening and shutting. This joint can be harmed or sick or painful in many ways and from many causes. Here is a short explanation of how and why the jaw starts to hurt.