The pain next to the ear when clenching the teeth is due to damage to the joint area, when clenching the teeth, the bite force is transmitted to the joint area and causes pain in the joint area, the more common cause is over-open mouth pulling or stress injury from biting hard objects may lead to this situation. You can pay attention to the usual self-protection, local hot compresses or physical therapy, and then to reduce the opening of the mouth, try to open the mouth to eat soft things, to carry out local protection, generally this situation can be good self-protection, about 1-2 weeks time can have a significant improvement.