Dental calculus is not contagious. 1. Dental calculus is mainly related to personal hygiene habits, dietary habits and physical fitness, and is generally not contagious. Calculus refers to the calcified plaque and soft scale deposited on the surface of the teeth. The initial formation of calculus is soft, after a period of calcification into hard and solid calculus, usually make the teeth yellowish-white or brownish-yellow. 2. When there are bad oral hygiene habits, eating too often, etc., a large amount of bacterial residue accumulates in the mouth, forming plaque attached to the teeth. If it is not removed in time, it will trigger the calcification of calcium ions in saliva, and then form dental calculus. In addition, when the teeth are misaligned and there are problems with the quality of saliva, it also favors the deposition of tartar and triggers dental calculus. If dental calculus is not effectively treated, it can cause redness, swelling and bleeding of the gums. It is recommended to visit a hospital for diagnosis and treatment under the guidance of a doctor.