The nerve can be killed by medication or root canal treatment. 1. Drugs: If inflammation of the nerve causes pulpitis, the nerve needs to be inactivated. The commonly used inactivating agent is arsenic trioxide, which is usually sealed inside the tooth. Currently, paraformaldehyde can also be used, which is a chronic inactivating agent and is safer. 2. Root canal therapy: Root canal therapy, also known as endodontics, is a treatment for pulp necrosis and root infection that can preserve the tooth. However, due to the cumbersome procedure, it usually takes 2 to 4 times to complete. Currently, with the development of technology and materials, one-time root canal treatment is also widely used. If you want to kill the nerve of the tooth, it is recommended to go to a regular hospital and choose an appropriate way according to your personal situation. Pay attention to personal hygiene in daily life, brush your teeth diligently, rinse your mouth more often and keep your mouth clean.