I had a root canal treatment on second molar(second to wisdom tooth) in lower jaw, about two months ago. Since the crown was too high, I had the crown ground after about a week, to make the bite normal. Since then, I started having a tingling sensation when tongue was made to touch the tooth. It became worse, with a numbness and burning sensation on the cheeks, which extends upto the chin. There is also ear pain on the side of this tooth. There were no pain on applying pressure on the root-canaled tooth, either before the treatment or even a few weeks after the treatment. However, now there is also pain on biting with the tooth. Please note that this pain is distinct from the numbness sensation that I have described earlier. Would I need to get a re-rootcanal or would it be preferable to extract the tooth ?