Shark’s teeth are also called retained milk teeth, and its hazards include affecting the development of the child’s jawbone, ectopic eruption of teeth, affecting the child’s nutritional absorption, and affecting the child’s oral environment. 1. Affecting the development of the child’s jawbone: the child’s milk teeth are retained, which will cause the position and direction of the permanent teeth to erupt abnormally, or even unable to erupt or teeth ectopic eruption, which will cause extrusion of the child’s jawbone of the normal development of the jawbone, thus affecting the development of the child. 2. Affecting the child’s nutritional absorption: retained milk teeth will make the child’s chewing rate decline, which will make the child’s nutritional absorption of food is not in place, thus causing a certain impact on the growth and development of the body. 3. Influence the child’s oral environment: when the permanent teeth erupt, this will make the child’s teeth gap becomes bigger, between the teeth easy to stuff food debris and generate a lot of plaque, which will lead to the emergence of dental caries. All of the above effects will affect the growth and development of the child, it is recommended to go to the hospital stomatology department as soon as possible for treatment.