A toothache that causes a dull headache can usually be treated with cold compresses, medication, and root canal therapy. 1. Cold compresses: When a toothache causes a dull headache, you can relieve your toothache symptoms by applying cold compresses, suggesting that you can use a cold, wet ice pack or a towel to apply to the cheek area of your toothache area for 15 minutes each time, and about 3 to 4 times a day, which can effectively relieve your pain. 2. medication: toothache and the emergence of severe headache and fatigue feeling, as an aid, you can take the appropriate amount of anti-inflammatory drugs under the guidance of the physician, such as oral erythromycin, amoxicillin tablets, with metronidazole tablets or ornidazole tablets combined anti-inflammatory. 3 Root canal treatment: If the intense pain caused by pulpitis, in addition to the routine oral medication, but also to go to the hospital for root canal treatment. Root canal treatment is the only effective treatment for pulpitis and apical periodontitis, through the root canal treatment method to remove the infected pulp nerve, the pain will disappear after the nerve is removed. If you have a toothache that causes headache and fatigue, you should consult a doctor and get targeted treatment.