The last two times I have been to the dentist for a filling, the numbness from the novocane does not go away. The first time, one whole side of my face and my tongue were number for 6 months. I went again yesterday and my tongue is still numb. What is causing this. My dentist said that there are a lot of nerves and if a nerve is hit with the novocane it could cause problems with the numbness not going away. He said this only happens in a very few people. But it has happened to my twice now - I think this is a little odd. Also, my jaw has been in an unusual amount of pain since my filling last night. Any suggestions?!