Tartar is a foreign hard mass attached to the teeth, like water rust in a kettle, so it is also commonly known as dental rust. The bacteria in the human mouth are diverse and complex, and there is often plaque formed by the adherent deposits of bacteria and their products on the tooth surface, which is very sticky and cannot be removed by normal cleaning measures such as rinsing and rinsing, and if the plaque remains on the tooth surface for a long time, it will gradually form yellow or grayish soft tartar, and with the gradual deposition of calcium salts in saliva and serum, the soft tartar will calcify and become tartar. Tartar itself tends to attract more bacterial toxins. The long-term local stimulation of these bacteria and their toxins and tartar can cause inflammation of the gums, with edema and congestion of the gum tissue, and erosion and easy bleeding of the gum margin. When eating, or even when talking or sucking, the gums tend to bleed, and in serious cases, the mouth is covered with blood in the morning after waking up. If tartar can be removed in time, gingivitis will gradually improve or heal. If the patient does not receive timely treatment, gingivitis will continue to develop, resulting in pus overflowing from periodontal tissues, bad breath and discomfort, destruction and resorption of alveolar bone, gum atrophy, root exposure, loose teeth, and the development of periodontitis. Periodontitis then develops further and bacteria infect the pulp tissue and periapical tissue through deep periodontal pockets and apical holes, causing retrograde pulpitis and periapical inflammation, which further develops into retrograde pulp and periapical abscess. It can cause pulp necrosis, extensive bone resorption, loose and fallen teeth medical education, education network collection! Therefore, tartar is very harmful to teeth, to prevent the formation of tartar, should do: 1, remove plaque on the surface of the teeth, the most simple and effective way is to carefully brush and floss correctly. Some information shows that high-quality brushing and flossing can remove more than 90% of the plaque and soft tartar on the teeth. 2. Attention should be paid to adjusting the diet structure, eating less soft and sticky food, especially children eating less food with high sugar content, or cleaning teeth in time after eating to reduce the formation of plaque. 3. Eliminate the bad habit of unilateral chewing, so that all teeth can perform their chewing function. 4, should go to the hospital stomatology department for examination every six months to a year, if tartar formation is found, timely removal by the doctor (commonly known as scaling, medically known as scaling).