Nerve pain is most likely deep caries or pulpitis, if you do not have the conditions to go to the doctor, you can take metronidazole, ibuprofen and other drugs for temporary analgesia, but these drugs eat, can only play a short period of time, and can not completely solve the problem of nerve pain. Timely to professional dentistry for treatment, the depth of caries and pulpitis, need to carry out root canal treatment. After root canal treatment the crown of the tooth may be subject to a certain degree of wear and tear, the hardness of the tooth will be reduced, it is recommended to go to do crown restoration.