The causes of tooth soreness in patients are mainly food embedding, periodontitis, periapical periodontitis, etc., as follows: First, food embedding: food embedding is common in patients with large gaps in the teeth. Long-term food embedding can lead to inflammation of the gum papillae, causing soreness and soreness of the teeth. Second, periodontitis: periodontitis patients will lead to root exposure, causing dentin hypersensitivity, when eating sweet and sour food, there will be teeth sore and swollen symptoms. Third, periapical periodontitis: Patients with periapical periodontitis usually have deep and large cavities on the tooth surface, and the inflammation spreads to the pulp and to the periapical tissues, causing the secretion of inflammatory exudate or even pus in the periapical alveolar bone, and when the tooth is subjected to occlusal stress, the periapical area will feel swollen and painful.