During the treatment of pulpitis, local anesthesia is used and the procedure is a painless one. After the treatment is over, some patients feel pain after going home. The reason for the pain after the pulpitis treatment is the following: 1. The symptoms of acute pulpitis can be somewhat painful after the treatment, because the acute pulpitis exudates very, very much, and the pulp is congested with blood, and the exudation is too much, which will cause a certain pressure on the pulp cavity of the pulp, and this pressure will give the patient a very painful feeling, and after sealing the medicine, there is no way to discharge this pressure. The patient’s pulp infection is very serious, and if this bacterial infection is not well controlled, the inflammation will develop further towards the root of the tooth, causing pain at the root or the tip of the root; 3. The pulp left in the tooth is not cleaned, also called residual pulpitis. This kind of residual pulpitis patients themselves will feel pain when they encounter hot or cold stimuli, or have a kind of spontaneous pain. Therefore, the above problems may occur after the sealant, and the patient may feel some pain after the sealant.