Bruxism and Morning Headaches
Bruxism means grinding or clenching the teeth, and it can occur while awake or asleep. It may accompany jaw soreness, tooth damage, and headaches. Waking with head pain alone does not diagnose bruxism, so persistent symptoms are worth discussing with a dentist and, when appropriate, a medical clinician.
A useful first step is to describe the teeth, jaw, and headache symptoms separately. That helps your care team assess what is happening without assuming that every morning headache has a dental cause or that a mouth guard will resolve it.