Headaches also can be caused by clenching jaw muscles for long periods of time. Signs that may indicate a headache of dental origin include: 1  Pain behind the eyes. 2  Sore jaw muscles or tired muscles upon awaking. 3  Teeth grinding. 4  Clicking or popping jaw joints. 5  Head and/or scalp is painful to the touch. 6  Earaches or ringing in the ears.