The Temporomandibular joint (TMJ) connects your lower jaw (mandible) to your skull and is situated on either side of your head in front of the ears. It is one of the most frequently used joints in your body and probably the most complex. Being a flexible hinge joint, it can move side to side as well as up and down allowing you to chew, talk and yawn. Its movement and position are controlled by muscles and ligaments attached to and surrounding it.