After the tooth is placed in the nerve killing medicine, the pain begins to ease, generally two to three days after the pain is no longer, but there are still a small number of patients will appear in severe pain, can be followed up to change the medicine or need to follow the doctor’s instructions to take pain relieving anti-inflammatory drugs for relief. Teeth to kill the nerve of the drug is generally inactivator, will be inactivator into the mouth of the root canal, inactivator will have a volatile effect so that the nerve of the tooth to lose sensation, pain will be gradually reduced, generally put the killing nerve of the drug after the symptoms will be relieved, generally one day after the teeth gradually lose sensation until the absence of pain, so the teeth to kill the nerve of the general two to three days after the pain is no longer. If the pain is very severe, you can use painkillers and anti-inflammatory drugs, such as ibuprofen and metronidazole, etc., to relieve the pain under the advice of the doctor. If the pain symptoms do not improve after taking the medicine, you can also consider going to the hospital, so that the doctor again on the local anti-inflammatory treatment, will be helpful for recovery. It is recommended that patients should pay attention to oral hygiene during this period, try not to eat hard food, avoid chewing on the same side, which can reduce the pain of the dental nerve, and if there is discomfort promptly seek medical attention.