The gap between the teeth is getting bigger and bigger to go to the hospital to check the teeth, if it is the teeth neighboring surface protrusion abnormality to restore the neighboring, if it is caused by periodontitis need to carry out periodontal treatment. 1. Abnormal teeth adjacent to the protrusion: the gap between the teeth is getting bigger and bigger may be the teeth adjacent to the protrusion of abnormalities, causing long-term food congestion, resulting in gingival papilla atrophy caused by the need to consider resin restoration or crown restoration to adjust the teeth adjacent to the relationship. 2. Periodontitis: oral periodontitis will lead to loss of periodontal attachment, alveolar bone resorption, gum recession, the gap between the teeth will slowly become larger, the need for periodontal treatment, to do the gingival cleaning under the gingival scraping to remove tartar and plaque, and, if necessary, to do periodontal surgery to control inflammation. After the periodontal inflammation is controlled, orthodontic treatment can be considered to close the gap. It is recommended to go to the hospital as soon as possible to deal with the gap, so as not to affect oral health.