Pulp extraction is professionally known as root canal therapy, which generally requires 2-4 times, and its process is as follows: 1. The role of the sealant is to disinfect the root canal; 3, the root canal cleaned and disinfected for tight filling, that is, root canal filling, after these three steps the whole root canal treatment process is complete; 4, the outside of the small hole filled up, root canal treatment that is the end of the pulp extraction process.