A six-year-old child’s toothache at night may be caused by dental caries, pulpitis, eruptive pericoronitis, etc., and the pain can be relieved by fillings, medication rinses, and surgical treatments. 1. Dental caries: Dental caries is a common cause of toothache in children, which is mainly caused by poor eating habits and bacterial infection. It can be treated with fillings to relieve the pain, and root canal treatment is recommended if it is more serious and inflamed. 2. Pulpitis: A six-year-old child’s toothache at night may also be caused by pulpitis, the symptoms of which are mainly manifested in spontaneous, radioactive night pain. The treatment is mainly surgical, such as pulpotomy and root canal therapy. 3. Peri-coronitis: six-year-old children are in the stage of tooth replacement, if the tooth eruption is blocked, it may cause peri-coronitis, resulting in patients with pain. You can use saline, compound borax solution, furacilin solution for rinsing gargle, relieve the child’s inflammation, if the symptoms are more serious can be removed under local anesthesia peri-coronary gingival flap, to promote the eruption of teeth. In addition to the above factors, do not rule out other causes, it is recommended to take the child to the doctor for standardized treatment.