Identifying milk teeth and permanent teeth can be done by the color of the teeth, the degree of tooth wear, the size of the teeth, and the thickness of the neck. 1. Tooth color: The color of milk teeth is white and permanent teeth are milky yellow. The enamel on the surface of permanent teeth is more transparent than that of milk teeth, and the yellow color of dentin will be visible. 2. The degree of wear and tear of the teeth: milk teeth have been used for several years, resulting in chewing, resulting in more wear and tear of the tooth tip. Permanent teeth have just grown out and rarely wear out. 3. Tooth size: milk teeth are relatively small, due to the child’s entire jawbone development is not very perfect. When the permanent teeth come out, the child’s age increases and the development of the jawbone is perfect, so the permanent teeth will be bigger.