Many parents have a misunderstanding: it’s okay to have poorly grown milk teeth, they will be replaced sooner or later. Professional dentist reminds: “Children usually start from 4-6 months to grow the first milk teeth, around 6 weeks of age began to change teeth, to 12 weeks of age basically replaced, milk teeth through the child 12 years long, this stage is also an important stage of the child’s growth and development.” Professional dentist, the children’s tooth replacement period generally from the age of 6 weeks, if the child to the age of 6 years old has not begun to change teeth, all the parents, please do not be anxious, generally speaking, from the age of 5 years old to the age of 8 years old to begin to change the teeth are normal, generally 12 weeks of age to the age of 14 years of age to the end of the replacement of teeth. Milk teeth have many important roles: 1, the child’s milk teeth is an important tool for chewing food in infancy, early childhood, preschool and school age. Healthy milk teeth give functional stimulation to the bones and muscles of the jaw and face when chewing, resulting in normal jaw and face development. Children who chew on one side of the mouth, the side that is not used will not have the benign stimulation of chewing, affecting the normal development of this side of the jaw and face, making the face asymmetrical. 2, the existence of milk teeth will leave a gap for the future growth of permanent teeth, if the milk teeth caries or early loss, can make the neighboring teeth displacement, permanent teeth eruption of the gap is not enough and the alignment is not neat, but also can make the permanent teeth erupt prematurely or delayed eruption. If left untreated, decayed baby teeth can cause pulpal and apical lesions. Root apical lesions can affect the development of inherited permanent teeth, resulting in enamel underdevelopment, yellowish-brown teeth, defective tooth surface, poor acid resistance, easy to get caries. 3, from the child began to grow the first milk teeth until the age of 5 ~ 6 years this period is the children began to pronounce and learn to speak an important period of time, normal, intact milk teeth will help children to pronounce correctly. Damage and loss of milk teeth will affect children’s pronunciation, making some children reluctant to open their mouths to talk and laugh, and bringing negative psychological effects to children. Therefore, young fathers and mothers should recognize the important role of milk teeth, from the child’s first tooth eruption that is to be protected, to develop a good habit of brushing; completely eliminate the milk teeth is temporary, irrelevant to the wrong view, so that your babies have a mouthful of healthy, beautiful teeth. Children in the replacement of teeth during the emergence of gingivitis, which is temporary, teeth in the eruption, gums covering the surface of the teeth, teeth have not yet grown out, repeated chewing will bite the surface of the teeth to cause injury. In addition, when the teeth have just erupted, there will be food debris on the surface, so there will be the possibility of gingivitis. Parents should always observe the status of their children’s oral hygiene, pay attention to oral health care, and should go to the hospital in time when problems are found.