The source of your jaw pain could be caused by a misaligned bite. When your bite is out of alignment, the upper and lower teeth meet incorrectly in what is called a “bad bite.” Under these circumstances, your jaw muscles have to work extra hard to do the job they were meant to do. Even at rest, stress is put on jaw muscles because of the misaligned joint. As time goes on, inflammation builds up. There are several large nerves running through the jaw area that control the face, head, neck and shoulders. When inflammation puts pressure on these nerves, it can cause pain in whatever area the nerve branch is running to.