Headaches due to toothache are commonly associated with acute pulpitis, which is an infectious lesion of the dental pulp caused by bacterial infection. In acute pulpitis, the typical features are spontaneous paroxysmal pain, pain that worsens at night, pain that is difficult to localize, and radiating pain. The radiating pain is the pain of acute pulpitis that radiates to the auriculotemporal region, or head, and the patient experiences severe pain. In acute pulpitis, medication is not effective and the pulp must be opened by finding the appropriate tooth position and applying a dental dynamics system. Patients with acute pulpitis usually experience immediate pain relief after the pulp is opened, and are then given the next step of root canal treatment and crown restoration.