In normal people or patients with mild gingivitis, there is no need to repair the gaps created after scaling because they are normal physiological gaps and are a normal manifestation of normal teeth. Because of the long absence of scaling treatment, the tartar has filled up the normal gap, so there is no need to treat this situation, just like a large amount of food residue left on the surface of the original teeth paste the gap, through brushing to remove the food residue, no additional treatment is needed. In the case of periodontitis, the gums recede and the bone is absorbed, resulting in loose teeth and large gaps between the teeth. In this case, scaling and subgingival scaling should be performed to thoroughly control plaque and calculus, and after it is determined that the periodontium is no longer receding and the teeth are no longer loosening further, orthodontic treatment can be considered to close the gap.