I had a root canal done about a month and a half ago. It was unsuccessful. It got infected and my tooth basically fell off, broke off. Went to the dentist and had it completely removed. I am on amoxicillin and have been since I noticed the infection. The dentist said the infection would go away once the tooth was removed. It's has been over a week and it is still infected in my upper jaw. It also is very sore. Should I go back? Or will it go away eventually? I am always having teeth problems, and they alway give me penicillin or amoxicillin. Have I become immune to this? For the pain they have me taking ibuprofen, it does nothing but burn my stomach. Please help me.