It is very difficult for patients to clean periodontal calculus at home, and there are many propaganda, such as water flossing or special toothpastes, that say they have the effect of removing tartar. This is mainly due to the formation mechanism and the location of the tartar. Calculus is a stone like substance formed by bacteria, food debris and salivary proteins mixed with each other over time. In addition to being tightly attached to the tooth surface, it is more difficult to remove in the gingival sulcus. Normally, it is impossible for our patients to see the exact location of the calculus with our own naked eyes, let alone clean it. To clean the calculus, it is best to go to the professional dentistry, the application of special equipment for scaling treatment, scaling can better remove the periodontal calculus and plaque, so that the periodontal to get a healthier purpose, generally recommended every six months to a year to the professional dentistry for dental scaling treatment.