It is necessary to clean the teeth because calculus is the material similar to the stone in the oral cavity due to the long-term deposition of plaque, which will be tightly attached to the tooth surface, especially within the gingival sulcus, and this kind of calculus is very difficult to be removed through the usual brushing method, and must be applied to the special scaling method to be able to remove it. Scaling is the application of ultrasonic scaler will be broken tartar and take out the process, also known as gingival cleaning, gingival cleaning can be removed above the gums basically all the tartar and plaque, so that the periodontal to achieve a healthier purpose, in general, patients suffering from gingivitis, after the scaling of the gingivitis symptoms will be significantly alleviated.