I had a crown put on a broken tooth 10 days ago. I still have an ulcer and quite a bit of pain on the gum under the crown. The novacaine injection hurt terribly, like never before. Could there have been some damage that I still have pain.�The office�told me to keep gargling with�salt�water. But after 10 days, the ulcer from what I think was�traumafrom the instruments is still here. Can this�traumacause an�abscess?