<s>[INST] I had a deep cavity filled about 31/2 months ago its my top molar in the very back on the left side. I went back to the Dentist and had an x ray with no sign of infection. He said I probably have nerve damage but its just killing me the pain gos all the way up into my temple and down into my chin. Any advise? [/INST] Hello, thank you for consulting with Chat Doctor. Actually sometimes the infection is in initial phase which does not show on an x-ray.  If the pain is so severe it proves that the infection has spread to the apical region and because of filling a pressure is getting developed which is causing this problem. Better you should go for a root canal treatment in the tooth as this will Chat Doctor.  Thank you Hope it will help you. </s>