Your TMJ, or temporomandibular joint is one of the most complex joints in the body. Proper motion of the joint depends upon many different factors. Many different muscles attach to the joint and can affect its function. The joint is actually two joints in one, and the surfaces of both sides of the joint need to operate efficiently for optimum function. The height of the teeth as well as missing teeth also affect how the joint, "rests". Problems with any one of these structures can lead to jaw pain, headaches, dizziness, earaches, ringing in the ears and popping and clicking. These symptoms can be mild or they can be almost debilitating.