January before the seven-year-old Ming Ming began toothache, mother thought it was fire also did not pay too much attention to a week after Ming Ming toothache suddenly aggravated and high fever, the next day the right half of the face is obviously swollen, the right eye has squinted into a slit, the mother only then panicked to bring the child to the hospital for examination, it turned out that Ming Ming right on the fourth milk teeth serious caries, the nerve of the tooth has been necrosis. The pain was caused by periapical inflammation of the tooth, and the spread of the inflammation caused infection in the infraorbital space due to the lack of timely treatment, which led to the swelling of the face. In the dental clinic, like Ming Ming such examples are very much, the reason is mainly because parents do not pay enough attention, always think that milk teeth sooner or later to fall off, treatment does not matter, as long as the pain is not on the line, in fact, twenty milk teeth from the age of 6 years old to replace, it will be about 6-8 years before all the replacement is complete. The caries of milk teeth will bring many adverse effects to children’s local and systemic, including (1) chewing function is reduced, in addition to affecting the children’s nutritional intake will also make the jawbone underdevelopment, resulting in crowding of permanent teeth. (2) Easy retention of food debris and deterioration of oral hygiene. (3) The development of caries in milk teeth into apical periapical inflammation will affect the inheritance of permanent tooth embryo and make its enamel underdevelopment. (4) Periodontitis of the milk teeth is easy to cause local alveolar destruction, or not easy to fall off and make the eruption of the lower permanent teeth too early or too late, affecting the order of eruption and position of permanent teeth. (5) Damage the oral mucosa. (6) Affecting aesthetics and pronunciation, which will cause some depression to children’s psychology. In addition to brushing the child’s teeth and teaching the correct method of brushing, young mothers should take their children to the hospital regularly for oral checkups. Because of the rapid development of caries in the milk teeth, usually once a quarter checkup. Mild caries can be treated once and moderate to severe caries can be treated twice. As long as the pulp is not inflamed, the treatment is less painful and easy for the child to accept.