I had a filling done on my lower back molar on my right hand side. This was quite a deep filling as there was cavities. Two months later, I needed a root canal. A month later, I was in severe pain, quite suddenly. I then was told there was an infection and a 7 day course of antibiotics would do the trick. It is now 9 days since taken antibiotics and although I was feeling a little better, I am in agony all over again. My dentist confirmed 2 weeks ago, the tooth was not damaged or chipped. I really do not want my tooth extracted. Any advice?