If the gap is caused by the expansion of the adjacent surface of the teeth, it is necessary to restore the adjacent, if it is caused by periodontal inflammation and gum recession, it is necessary to carry out periodontal treatment. 1. Narrow teeth adjacent. The gap between the teeth may be too narrow, causing long-term food impaction, gingival papilla atrophy caused by the need to use resin restoration or crown restoration, to restore the teeth adjacent to avoid food impaction. 2. Gingival recession. Poor oral hygiene conditions, tartar accumulation can be triggered by periodontitis, loss of periodontal attachment, gingival recession resulting in large gaps in the teeth, the need for periodontal treatment to remove tartar, if necessary, to do periodontal flap surgery to eliminate periodontal inflammation. Large gaps in the teeth also need to avoid using toothpicks to clean the gap, so as not to damage the gums leading to a larger gap.