Extra pain on the first night after a dental sealant is usually normal. The appearance of pain may be caused by drug action, incomplete necrosis of the nerve, poor diet, and so on. Usually after 3 to 5 days, the symptoms will gradually ease and disappear, so patients do not need to worry too much. Dental sealing is generally referred to as one of the steps of dental root canal treatment. It is usually normal for patients to experience pain on the first night after implantation of pulp inactivation medication. The pain may be due to the effect of the medication, the nerve not being fully inactivated or due to the patient eating spicy, irritating or too hard food. The pain is usually relieved after 3 to 5 days. If the patient is in severe pain and the symptoms have not been relieved, painkillers can be used to relieve the pain. When the tooth is still in severe pain after 1 to 2 days or when the tooth has abnormalities such as tissue fluid oozing out, it is important to go to the hospital for a follow-up appointment in a timely manner.