Many parents due to the lack of children’s oral health care knowledge, that the milk teeth are anyway to be replaced, bad without treatment, resulting in some of the milk teeth of caries, pulp periapical disease, trauma, etc. can not be timely treatment and fall off or extraction, resulting in premature loss of milk teeth. Early loss of milk teeth should be done in a timely manner gap retainer, in order to ensure the normal development of the child’s teeth, joints, facial development, and promote the healthy development of the child’s whole body. What are the dangers of premature loss of milk teeth? Reducing chewing efficiency and affecting children’s physical development: After the premature loss of milk teeth, especially the premature loss of multiple milk teeth, children’s chewing ability decreases, and they cannot grind food effectively, which increases the burden on the digestive system and may cause indigestion and other digestive diseases, affecting the absorption of nutrients, thus affecting the healthy development of children’s bodies. Impact on children’s pronunciation and mental health: Most children with missing front teeth do not dare to laugh out loud or cover their mouths with their hands, and are reluctant to communicate with others, which affects children’s self-confidence and mental health. Partial chewing, affecting the development of the child’s jaw and face: the early loss of one side of the molar is likely to cause the child to chew only on the opposite side, stimulating the development of the opposite side of the jaw and chewing muscles, and the side of the missing teeth is useless, thus making the development of both sides of the jaw and the jaw and face asymmetrical. Loss of dental arch space and misalignment of inherited permanent teeth: after early loss of milk teeth, the neighboring teeth on both sides will be tilted and displaced to the gap, and the dental arch space will be lost, which can cause obstruction of the eruption of inherited permanent teeth or ectopic eruption resulting in misalignment of permanent teeth.