Patient’s question: disease: the right side of the seventh lower tooth root canal treatment content: main symptoms, onset time: pain, a week ago examination time, content: this Sunday Previous treatment and results: the last big tooth on the lower right. 7 years ago filled, two months ago in the last side of the tooth near the flesh of the tooth lost a small piece of tooth, after pain, a month ago in XX hospital for drug observation after 3 weeks to fill the lost part, the filling after the filling is still too hard to bite. After the filling, I still feel afraid to bite hard things, but it doesn’t hurt when I don’t use it. 1 week ago, it suddenly became painful, and it also hurts when I don’t use it. Today, the examination said that the nerve is inflamed and root canal treatment is needed. The doctor drilled out the original filling material and used a long, thin needle to pick the nerve in the tooth (the process was slow and painful), then took a dental film, then continued to pick, then took a second dental film, then used a 2-3 cm long iron needle to drill inside, then applied medicine and said I should pass in 3-5 days. What kind of help do I need: 1. Has the nerve been picked out? 2.What else do I need to do for the next treatment? 3. What are the potential dangers of the following treatment and will it still be painful? I’m going to see you again soon, and I’m not sure what to expect, so I’m looking forward to your answer. Yang Yang, Department of Stomatology, Beijing 301 Hospital, replied: 1. According to your description, the treatment done by the doctor should be pulp extraction and root canal preparation. If there is inflammation in the pulp, the nerve may not be formed, and it is possible that the extraction may not be clean at one time, and there may be pain at the next visit is normal. As the treatment continues, after the root canal preparation is completed, the root canal will be cleaned. 2, the next treatment: if your last treatment root canal preparation once in place, no symptoms can be root canal filling; if your last treatment is only the first preparation of root canal, then the next will have to continue to prepare the root canal, and wait until the next follow-up to do root canal filling. 3, for the third point of your consultation, you can go to the article of my consultation guide [filling, root canal treatment patient information] in article 7 and 10, the above is very clear.