It takes ten days after the second change of the Dental Nerve Killer to change to the third main wait for the medication to take effect, but the waiting time after the second change of the Dental Nerve Killer varies from person to person, and the patient should follow the doctor’s instructions. The second change of the dental nerve, mainly placed in the slow inactivation agent, it can continue to paralyze the nerve, reduce the nerve pain. It takes time for the slow inactivator to take effect, generally 3-10 days. After the slow inactivator has taken effect, the pulp chamber is opened, the inactivator is removed, and the killed pulp can be removed intact for subsequent treatment. However, it is not necessary to wait ten days after the second change of the killing nerve to change for the third time, it mainly depends on the drug effect after the second change of the drug is exerted, the slow inactivator is placed in the pulp for too long, it may also form a medicated apical inflammation and other problems. Therefore, you should follow the doctor’s instructions and return to the hospital at the time required by the doctor to change the medication during the nerve treatment.