Scaling, commonly known as scaling, is the medical term for supragingival scaling, which refers to the removal of tartar, plaque and stains on the gums with a scaling instrument and the polishing of the tooth surface to delay plaque and tartar redeposition. Scaling is a good dental health care tool and the primary measure for the treatment of periodontal disease. Through regular scaling, not only can plaque and calculus on teeth be completely removed to keep periodontal tissues healthy and prevent periodontal disease, but also, it is easy to find small imperceptible dental diseases, such as relatively hidden caries, so as to achieve the purpose of early detection and early treatment. Plaque is the main cause of periodontal disease and will continue to re-form on the tooth surface after it is removed. When plaque is not removed, and mineral salts in saliva are gradually deposited, tartar will be formed over time. The presence of tartar brings plaque in close contact with the tissue surface, causing an inflammatory response in the periodontal tissue. In addition, the porous structure of tartar tends to absorb large amounts of bacterial toxins, and tartar also hinders brushing. If not removed for a long time, it may cause gingivitis, periodontitis, bleeding gums, bad breath, and eventually loose teeth and even tooth loss. Tartar cannot be removed by brushing after it has formed. According to the different parts of tartar deposition, it can be divided into supragingival tartar and subgingival tartar by the edge of the gums. Scaling mainly removes supragingival tartar, but the shallow subgingival tartar connected with supragingival tartar in the gum sulcus should also be removed during the actual operation. Pigmentation is also present on the teeth due to the consumption of some foods and colored drinks, etc. The pigmentation is especially noticeable in people who smoke for a long time and who like to drink dark beverages, which greatly affects the appearance of the teeth. During supragingival scaling, these pigments are also removed. However, since the tooth surface is not as smooth and flat as a mirror, it is not possible to remove the pigment completely, and there will always be some pigment remaining in the recessed areas of the tooth surface. The main purpose of scaling is to prevent and control oral diseases, not just to look good. The inflammatory condition of gingivitis and periodontitis can be reduced by scaling, but scaling alone cannot cure periodontitis. To cure periodontal disease, further cleaning should be done after scaling.