The main reasons for the growing gap between teeth are gum recession, thinning of teeth, and in a few cases, it may also be caused by tooth decay. The causes of gum recession include periodontal disease, improper brushing, and food impaction. The cause and symptomatic treatment can be carried out according to the cause and the patient’s symptoms. First, the treatment of the cause: 1, gum recession: for gum recession should find the cause of gum recession, for the cause of treatment. Pay attention to correct bad brushing habits and methods, rinse your mouth after meals to avoid food embedding. If periodontal disease is present, the primary disease should be actively treated, for example, calculus should be actively removed. If necessary, surgical transplantation of gingival flap and lateral transposition flap can be taken; 2, sparse teeth: for patients with sparse teeth, food can be prevented from entering the gap of teeth by wearing food-embedded orthodontic appliances when eating, and light curing can also be carried out under the guidance of doctors to repair the shape of teeth or add dentures to reduce the gap; 3, dental caries: for the increasingly large gap caused by dental caries, fluoride remineralization, fissure closure treatment can be taken. Fluoride remineralization, sulcus closure treatment. If necessary, filling and crown restoration treatment can be taken to reduce the gap. Second, symptomatic treatment: the cavity can be filled by light-curing resin to restore the normal tooth shape and reduce the distance of the gap. In addition, various orthodontic appliances such as traditional metal brackets, ceramic brackets and bracketless invisible braces can be worn to reduce the distance between teeth. It is worth noting that in daily life, we should pay attention to changing the way we brush our teeth, not to brush horizontally, we can take the modified pasteur brushing method to brush our teeth, floss diligently to remove food residues, rinse our mouth after meals, and go to the hospital for oral examination regularly to maintain oral hygiene and health and prevent periodontal diseases.