The treatment of dental calculus includes two aspects, controlling the development of dental plaque to minimize the formation of dental calculus and removing the formed dental calculus through ultrasonic scaling. 1. The formation of dental calculus is closely related to the degree of cleanliness in the oral cavity, and the activity of plaque in the oral cavity will gradually promote the formation of dental calculus. By controlling plaque, the formation of dental calculus and the erosion of gums by bacteria can be reduced. 2. Attention should be paid to frequent brushing, use toothbrush to clean the tooth surface carefully after three meals per day, and use dental floss to clean the parts that are not easy to clean by toothbrush. Clinically, the ultrasonic scaler is used to clean the formed calculus and plaque on the teeth, and the patients may have bleeding gums within one week after the ultrasonic scaler, and they may have a feeling of soreness when they eat cold food and drink cold water. If patients find that the formation of dental calculus on the teeth, they should go to the hospital stomatology department in time, under the guidance of the doctor to clean up the calculus, and should pay more attention to the maintenance of oral hygiene in daily life.