Hi, Welcome to HealthcareMagic Forum.
There are various causes for this, like you have mentioned a Toothache which could cause a referred pain
to your head, other causes could be Stress, Anxiety, Poor Posture, Jaw Clenching. Kindly get yourself examined by a Neurologist
so that he can examine you thoroughly and rule out the exact cause. If necessary he might order a CT scan of head. Also get a Second opinion
from a Dentist
. Stick to your treatment plan and go for regular follow up.
If you smoke or Drink, QUIT. Avoid stress and exercise regularly, adopt a perfect posture while lying down or sitting that places minimal stress on your neck muscles. Practice relaxation techniques
like yoga and meditation.
Hope I have answered your query, I Will be available to answer your follow up queries.
Wish you Good Health.