<s>[INST] I had two fillings done today on the lower teeth, one was very deep and a large dose of anesthetic had to be used. The numbness was still around after 3-4 hours and I ate something small 3 hours later when I still had some numbness although I tried not to chew on that side of the mouth. I now have severe headache on my forehead and top of my head, its gradually worsening and keeping me up. What could the headache be from? [/INST] Heloo pt-The most likely explanation to your symptoms is that the nerve inside the tooth may be inflammed.  This can occur when the cavity and therefore the filling is very close to the nerve inside the tooth. The condition is called irreversible pulpitis and the treatment is root canal therapy.  There are simple tests a dentist can do to confirm this diagnosis.  The radiating pain you are describing is not uncommon with inflammed or infected teeth. </s>