How come there's still pain after the tooth nerve has been removed?

It is still possible to experience pain after a tooth nerve has been removed, and this is usually related to multiple factors. 1. It may be due to anatomical variations in the root canal, resulting in incomplete removal of the tooth nerve. Remaining nerve tissue or inflamed root pulp can cause pain. 2. Exudation at the root apex is another common cause. During the process of root canal enlargement, the periapical tissues may be stimulated, leading to exudation, increased tissue tension, and subsequent pain. 3. Inflammation such as pulpitis or apical periodontitis may also be a source of pain. If the pain is severe, prompt medical attention is recommended to identify the cause and initiate appropriate treatment. To relieve pain, patients can try daily care measures such as ice application, medication such as antibiotics, or undergo root canal filling treatment under a doctor's guidance. Maintaining good oral hygiene and avoiding irritating foods are also important preventive measures.