Once a child loses milk teeth prematurely, parents should take the child to a pediatric dental specialist clinic for examination and radiographs to determine the development of permanent tooth germs. Premature loss of milk teeth can cause the neighboring teeth to be tilted and shifted, and the opposing teeth to be too long, making the gap between the missing teeth smaller and causing the permanent teeth to erupt with difficulty or crowding. It can also cause early eruption of permanent teeth, especially when the milk teeth have chronic apical inflammation. The roots of prematurely erupted permanent teeth are undeveloped, which can cause them to loosen or even fall out when biting hard objects. The surface enamel of prematurely erupted permanent teeth is immature, poorly calcified and prone to caries. Therefore, it is necessary to make a gap retainer to maintain the gap between the missing teeth, or use an eruption blocker to prevent the premature eruption of permanent teeth.