A toothache caused by eating something hard may indicate the presence of periapical periodontitis, or the presence of cryptic fracture, and it is recommended that the patient go to the dental clinic as soon as possible, which can generally be treated by root canal therapy, light curing of the tooth, tooth extraction and other ways of treatment. 1. Periapical periodontitis: Patients with periapical periodontitis can have their root canals cleaned and shaped through endodontics to promote the healing of periapical lesions as much as possible, thus improving the symptoms of toothache. 2. Cracked tooth: Eating hard things may damage the teeth, resulting in cracked teeth and toothache, patients with shallow cracked teeth can use acid etching and enamel bonding agent for light curing treatment. Patients with deeper fissures and severe destruction of the tooth can have crowns restored after root canal treatment, and teeth that cannot be retained can be treated by extraction. Patients are advised to pay attention to oral hygiene, brush their teeth regularly, and go to the dental clinic for follow-up regularly.