If the nerve was already necrotic before the root canal treatment, there will be no pain during the whole process of root canal treatment. If the pulp is alive before the root canal is performed, there may be some pain during the root canal procedure. However, the doctor will inject a local anesthetic during the root canal treatment, so there is no need to worry too much. If the tooth has reached the level of root canal treatment that proves to be serious, it is recommended to follow the professional advice of the treating doctor. Because everyone has a different level of pain perception, the pain felt during root canal treatment is not the same. Root canal treatment is also commonly known as nerve killing, which is a better treatment for pulp infection and pulp exposure. However, after root canal treatment, the tooth will become relatively weak without nutrient supply, so it is recommended to protect the remaining roots with porcelain crowns.