Toothache stretching half of the face nerve pain may need to kill the nerve to do root canal treatment or extraction of the affected tooth, it is recommended to go to the dentist specific examination and treatment. Toothache stretching half of the face nerve pain may be a condition of pulpitis, may also be caused by tooth splitting. 1. Pulpitis requires root canal treatment, root canal preparation to take out the nerve and residue of the tooth, clean the root canal, disinfect it, and then fill the root canal with alternative materials, repair the tooth or do porcelain restoration. 2. Toothache caused by tooth splitting or pulpitis in non-functional teeth can be extracted.