How long it takes for occlusal pain to disappear after root canal treatment is mainly related to the cause and severity of the pain as well as the physical quality of the patient, and cannot be generalized. After conventional root canal treatment, due to the stimulation of root-filled material, individual patients will have occlusal pain, which will generally disappear on its own after 3-4 days without treatment. If the pain is more severe, medication, such as antibiotics and NSAIDs, is required, and the pain symptoms will generally disappear within 7 days. If it is caused by other reasons, such as occlusal trauma, apical inflammation, incomplete root canal treatment or tooth fracture, patients are advised to visit the stomatology department in time for examination by a professional doctor to clarify the cause and then treat the problem. In addition, patients should pay attention to rest in daily life, avoid eating spicy food during treatment, and can eat more high-calcium food. Pay attention to brushing teeth in the morning and evening, and pay attention to oral hygiene.