From 6 to 12 years old is the period of tooth replacement, which is medically known as the period of tooth replacement and mixed dentition. During this period, parents should pay attention to the difference between baby teeth and permanent teeth, otherwise it is easy to confuse them and even pull out permanent teeth as baby teeth, resulting in permanent loss of permanent teeth. So how to distinguish the baby teeth from the permanent teeth? Usually, you can distinguish them from the following four points: 1. color: the milk teeth are white, while the permanent teeth are slightly yellow. This is because the enamel on the surface of permanent teeth is more calcified and transparent than that of milk teeth, which will reveal the yellow color of dentin. Feng Jinqiu, Department of Pediatric Dentistry, Shanghai Stomatology Hospital 2. Volume: The milk teeth are smaller than the permanent teeth of the same name. This is because children’s jawbone is relatively small, with the increase of age, the jawbone gradually develops and grows, the capacity expands, and the newly grown permanent teeth are larger than the eponymous milk teeth. 3, wear and tear: breast teeth because of chewing for several years, the tip of the tooth wear more, while permanent teeth have just grown out, very little wear and tear. 4.Cervical part of teeth: The cervical part of milk teeth is thinner than the cervical part of permanent teeth.