I have experience in this field. I had root canal therapy for two teeth last year. Nerve agent refers to root canal therapy. There is a hollow structure in the middle of each tooth. The medical term is pulp cavity, and the cavity in the root is called root canal. This cavity, which is used to communicate between the inside of teeth and alveolar bone, contains nerves and blood vessels, providing nutrition and feeling for teeth. The term is called dental pulp. Dental caries is a bacterial infectious disease. When dental caries progress near the pulp cavity, bacteria will invade the pulp, leading to pulp inflammation. All inflammation is accompanied by tissue edema, and the teeth are hard and inelastic, so the intra-medullary pressure will rise and bring pain.

This is the answer to your question:

1. During root canal therapy, teeth may feel uncomfortable, which varies from person to person. As long as it is not severe pain, it is generally normal. Just relax yourself and avoid chewing the affected side. It took me two weeks to kill my tooth nerve. I went to the hospital in the first week and found that my teeth were still sour. The doctor said it was not completely killed, and it would take a week. Only after I confirmed that it was completely killed.

2. Root canal therapy is a simple treatment method, which removes the inflammatory pulp tissue in the pulp cavity and root canal, and fills it with medical filler after cleaning, so as to minimize the probability of tooth inflammation (inflammation at this time may be inflammation of periodontal tissue). It is the most suitable treatment method for pulpitis widely used in the world at present, and the drug is harmless to human body.

3. The specific time depends on the situation. The usual course of treatment is to go to the hospital 2-4 times, each time with a week interval. However, if the inflammation is serious and there is more exudation, the observation time and the number of drug sealing will increase. So don't be impatient, good treatment has good effect, and time can't catch up.