Dental cleaning is commonly known as scaling, scaling is mainly divided into two types: First, if the patient only exists supragingival calculus, it is only necessary to remove the calculus in the mouth through ultrasonic supragingival scaling, the cost of ultrasonic supragingival scaling is relatively low, about 200-300 yuan once, it is recommended that patients should have ultrasonic scaling once every 6-12 months to regularly remove the calculus in the mouth, etc. and maintain good oral hygiene. Second, if the patient not only has supragingival calculus, but also subgingival calculus, the ultrasonic supragingival scaling alone can not completely remove the calculus in the mouth, but also requires manual subgingival scaling, through the scraper to remove the calculus located below the gums, the cost is relatively high, about 2,000 yuan, it is recommended that patients regularly go to the hospital for examination, once found to have subgingival calculus timely It is recommended that patients go to the hospital for regular checkups and have their subgingival calculus removed as soon as it is found to avoid aggravating periodontitis.