Teeth, jaws and bites!
It might cause headaches when you’re least expecting it. The culprit? Misaligned teeth. If you’re teeth aren’t straight, or you have an uneven bite, this can trigger problems not only above the neck but all through the body. Your teeth may move around at various times in your life, due to growth, bad habits, or an accident. You muscles may get used to the alignment, and headaches may go away. Or, things may get worse with time. New dentures may cause problems, or other work done on your teeth.
Dentists refer to bite problems as malocclusion, and sometimes it’s easy to treat and sometimes it’s not. If you suspect that you may be getting tension headache, or migraine symptoms, from problems in your mouth or jaw, talk to your dentist.
It may help you to get a quick overview of some malocclusion problems, check out this article by Dr. David Leader. Does anything here sound like you?