Toothache after eating may be due to caries, endodontitis or apical periodontitis, periodontal disease, etc. In terms of treatment, filling treatment, root canal treatment, and periodontal sequential treatment, etc. are required. 1. Caries: Most of the pain is caused by food embedded in the cavity, and the pain will disappear after cleaning out the embedded material. It is recommended to remove the decayed tissue and fill the cavity. 2. Pulpitis or periapical inflammation: Temperature stimulation during eating and pressure from food impaction will cause pain, which usually lasts for some time before it is relieved. The tooth usually has a visible cavity and requires root canal treatment to remove the infected pulp and clean the root canal before filling. 3. Periodontal disease: Mostly due to resorption of the alveolar bone, gaps appear in the teeth, and food is embedded between the teeth after eating, causing gum swelling and pain. Pay attention to oral hygiene, pick out the food embedded in the gap can relieve the pain, periodontal disease needs to go to the hospital for periodontal sequence treatment. It is recommended to go to a regular hospital stomatology department, by the physician examination after a clear diagnosis, and the cause of the treatment.