I had a crown in one of my teeth on the lower left bottom. The crown came off. I went to the dentist who suggested root canal even when I did not have any problem. The root canal was completed and the crown was placed. After a few days, my teeth used to pain only on consuming hot water. I went to the dentist and she performed RCT again and now she has left it open because now I have a constant pain which is there a from two weeks. The dentist said I might be allergic to calcium hydroxide and then she said it could be an infection. I am not sure what is happening. Kindly help. Pain is unbearable.