The gap between the teeth is generally not self-recovery, clinical causes of large gap between the teeth may be periodontitis, neighboring caries, physiological gap is too large, etc., and its corresponding treatment is also different. 1. Periodontitis: clinically, periodontitis patients due to dental calculus and plaque and other stimulating factors for a long time on the gums caused by pressure, which will lead to gum recession, in addition to the alveolar bone may also be different degrees of absorption, so that the gap between the teeth become larger. This situation requires patients to go to the hospital in time for periodontal treatment to prevent further loosening of teeth. 2. Neighborhood caries: improper cleaning of the teeth adjacent to the gap, the probability of food debris embedded greatly increased, resulting in dental caries adjacent to the teeth, making the gap larger. Patients need to go to the hospital in time to take a panoramic film to confirm the diagnosis, as soon as possible after the removal of decayed tooth tissue, with dental filling materials to repair the teeth adjacent to the relationship. 3. Physiological gap is too large: teeth in the process of eruption by a variety of factors may appear gap is too large phenomenon, you can be on the teeth of veneer repair or orthodontics and other ways to correct. In addition, the physiological gap during the replacement period is likely to return to normal with the eruption of permanent teeth, and generally do not need special treatment. It is recommended that patients with large gaps or other discomforts should consult a doctor in time to assess their condition and follow the doctor’s instructions for treatment.