Dental calculus is deposited on the surface of the teeth after the calcification of plaque and soft scale formation, cleaning calculus for the effective method of gingival cleaning and subgingival scraping. 1. Gingival scaling: At present, ultrasonic scaling is commonly used in clinical practice, which is also commonly referred to as scaling. Using ultrasonic oscillation to remove calculus and plaque above the gums, and then polished to minimize the re-formation of plaque and calculus. 2. Subgingival Scraping: Specialized instruments are used to remove calculus and plaque from the root surfaces located in periodontal pockets. Since calculus, once formed, cannot be removed by daily brushing and flossing, it is generally recommended to have your teeth cleaned every six months to a year to maintain periodontal health. If you suffer from periodontitis, you may need to have your teeth cleaned more often.