Scaling can effectively prevent bleeding gums, oral odor and other symptoms, to maintain the health of periodontal tissue is a certain benefit. Scaling (clinically known as ultrasonic scaling) is one of the routine treatment items of oral periodontology, which is mainly used to remove the pigment, tartar or calculus and other inflammatory irritants on the surface of teeth; the principle of ultrasonic scaling is to use the ultrasonic waves generated by the scaling tool to shake the above substances to clean them up. Therefore, ultrasonic cleaning can effectively maintain oral hygiene, and bleeding gums, oral odor and other symptoms have a better preventive effect; and it is only for tartar or calculus and other cleaning effect, the teeth will not cause damage to the role.