When there is calculus on the teeth, it can easily attract more bacteria and toxins, leading to red, swollen, bleeding, and inflamed gums. Tartar is usually caused by environmental alkalinization, elevated phosphodiesterase, colloidal protein overflow, and dietary habits. 1, environmental alkalinization: usually due to saliva and bacteria caused by alkaline teeth in the mouth, pH value increased, calcium salts easily precipitated to form dental calculus. 2, elevated phosphatase: usually due to inflammation and trauma in the body when the enzyme content of the oral cavity increases, easily leading to the accumulation of phosphate in the saliva, saliva will release carbon dioxide, promote insoluble calcium salts closely deposited on the teeth, and the formation of dental calculus. 3, colloidal protein overflow: saliva contains colloidal protein, which can eliminate foreign bacteria, virus feeding, the process of elimination will produce colloidal protein, these colloidal protein and calcium ions combined to form a chelated calcium-like substances, can adhere to the tooth surface to form calculus. 4, dietary habits: long time to eat colorful food easy to cause great stimulation to the teeth, such as smoke, coffee, tea, etc., if not timely cleaning, the tooth surface will have a large amount of pigment accumulation, a long time will form calculus. The speed and development of calculus formation varies from person to person, it is recommended to remove it in time at the early stage of calculus, if calcification occurs it is difficult to remove.