<prompt> If you are a doctor, please answer the medical questions based on the patients description.I had root canal treatment 3 weeks ago and since cannot eat without pain and aching in my jaw and also the side of my face is numb. I went to see the dentist a week ago and he said it was nothing to do with the root canal and if persists he will have to refer me??? I am going back to see him tomorrow but need to understand what can be done.  <response>: Which tooth was operated ? Was it the last molar in the lower jaw ? Though root canal doesnt have any effect on jaw, a variety of other factors may be causing your problem. Contact of needle to a nerve trunk may cause numbness. Relax, it will take time but is self-healing. For e.g. opening your jaw too wide, infection related to the third molar of the lower jaw. Treatment is symptomatic after ascertaining the cause. 