Hi Sir, I had tooth filling from 8 years. Suddenly there is a severe pain on this tooth. 1. No pain while chewing or tapping tooth. 2. But severe pain during drinking / eating hot / cold food. 3. Pain is there upto 20-30 mins after hot/cold drink/food. I had visited dentist. He checked 1st teeth 1. He checked teeth is ok and white. 2. He checked tooth feeling is also ok. 3. I informed about above severe pain and sensitivity. 4. He taped teeth but no pain there and after 3-4 days pain is gradually decreased compare to previously. 5. Then he checked with x-ray. He saw something in x-ray and told me that there is "sado"(" caries) below tooth feeling. He said he doesn't know how it reached there. He advised me for root canal. And prescribed antibiotics and painkillers. I asked home about 2nd time tooth re filling after cleaning caries. But he said it's not possible and root canal required. Nowy questions are 1. Is it possible to remove tooth filling and clean care and again do 2nd time tooth filling? 2. My pain is reduced. After taking antibiotics, will it resolve on its own? 3 how caries is present under feeling? 4. Should I do rct or wait?