Does tooth decay affect permanent teeth, generally speaking, whether the decay of milk teeth affects permanent teeth, then the answer is yes, the decay of milk teeth will affect permanent teeth. Indeed, many parents think that children’s milk teeth and permanent teeth are two sets of teeth, and the problems of milk teeth do not necessarily mean that permanent teeth also have problems, this view is one-sided. However, due to the anatomical structure of the baby teeth, once the baby teeth are decayed, the progress is very fast and it is easy to form a wide range of caries, pulpitis and periapical inflammation of the baby teeth. The periapical periodontitis is below the permanent tooth embryo, and the more serious periapical periodontitis may cause the damage of the crown of the permanent tooth embryo, which is called Turner’s tooth, and this situation is not rare in the clinic. In addition, the caries of milk teeth will also affect the nutritional absorption and facial shape of children, and at the same time can affect the development of jaw arch of children. In simple terms, if the caries of milk teeth is more serious, it may cause the early loss of milk teeth, and the early loss of milk teeth will make the permanent teeth erupt in insufficient position, and form the crowded permanent teeth. At present, many adolescents with irregular teeth are caused by early loss of baby teeth without timely treatment.