Normally, children start to change their teeth around the age of 6, when the baby teeth start to fall out physiologically and the permanent teeth that replace the baby teeth erupt one after another, and by the age of 12-13, all baby teeth are replaced by permanent teeth. This is the period of tooth replacement in children. The sequence of the period of tooth replacement in children is as follows: the first permanent molar, also called the sixth molar, grows immediately behind the last milk molar at the age of about 6 years; it is slightly earlier than the lower central incisor or at the same time, the lower molar incisor falls out and the permanent lower central incisor grows out at the age of about 6 years, the upper molar incisor falls out and the permanent upper central incisor grows out at the age of 7-8 years, the lower molar lateral incisor falls out and the permanent lower lateral incisor grows out at the age of 8 -At the age of 9, the upper mammary incisors fall out and the upper permanent lateral incisors come in; at the age of 9-12, the first and second molar teeth fall out and the first and second bicuspids come in; at the age of 10-12, the milk cuspids fall out and the permanent cuspids come in. During the whole period of tooth replacement, it is an important period for children to protect their teeth. First of all, the first permanent molar that erupts earliest, i.e., the sixth molar, has the role of positioning and setting the height of the child’s jaw and facial growth, and has an impact on the eruption of other teeth, whether they are aligned or not, so protecting it can benefit for a lifetime. Secondly, attention should be paid to correcting various bad habits of children during the period of tooth replacement. During the 6-7 years of tooth replacement, children are usually prone to bad habits, such as nail biting, lip biting, tongue biting, tongue stretching, licking teeth, etc., which can directly affect the alignment and beauty of the teeth, facial development asymmetry, thus leaving a lifelong regret in appearance. Some permanent teeth have erupted, but the individual milk teeth still do not fall out, should be extracted to the Department of Dentistry. For individual stubborn, can not correct their own bad habits, should go to the dentist as soon as possible, with orthodontic appliances to help correct. Thirdly, pay attention to the prevention and treatment of molar caries. Therefore, we should pay attention to the timely treatment and prevention of molar caries, and never have the wrong concept that molar teeth have to be replaced sooner or later, and there is no need to treat them when they are bad. Doctors advise: should try to make the milk teeth retained until the eruption of permanent teeth, such as premature loss of milk teeth, often lead to secondary permanent teeth eruption gap is not enough to cause dental alignment, and even lead to permanent teeth buried and not out. Fourth, the permanent teeth should be regularly observed orthodontic treatment. When changing teeth, the front permanent teeth to the lower or inner eruption of the milk teeth, erupting permanent teeth that is the size of adult teeth, mild crowding, twisting or gap is normal, can be adjusted with the eruption of adjacent teeth and jawbone growth and development of their own alignment, as long as it is not antitussive (i.e., envelope), generally do not need to be orthodontic, but to do regular observation, the longest should not exceed six months. If the teeth are still misaligned after complete replacement of milk teeth, you should consult a doctor in time to avoid delayed treatment, resulting in orthodontic difficulties. Fifth, the education of children during the period of tooth replacement pay special attention to dental care. During the period of tooth replacement, the teeth are not aligned, permanent teeth erupt and the milk teeth are left behind, causing double rows of teeth, if the child eats more food containing cane sugar and does not pay attention to oral hygiene, causing poor dental cleaning and food retention, which will easily lead to dental caries of milk and permanent teeth. Therefore, we should pay attention to educate children to brush their teeth carefully and eat more fiber-containing food at this time, which can help them clean themselves and promote the growth and development of jaw bone and jaw face. Children’s tooth replacement period six major attention For five or six-year-old children, tooth replacement may be more important than letting them play piano, roller skating, learning arithmetic. This is because the new permanent teeth will be with them for almost their whole life, and are related to their diet, appearance, and even psychology. Health and care during the period of tooth replacement is very important and directly related to whether the child’s future teeth are neat and beautiful. Therefore, parents should take better care of their children during this period, so that they can have a good tooth. Note 1: Whether the milk teeth are retained or lost early There is a certain time and sequence for the milk teeth to fall off, and the teeth should fall off but not fall, which is often the consequence of permanent teeth can not erupt in the normal position. Most children start to replace their teeth at the age of five or six, while some start at the age of four, and some children lose their first milk tooth as late as seven. Tooth loss usually begins with the lower two incisors, followed by the upper two incisors. Most commonly, the lower front permanent teeth erupt on the inside of the milk teeth and the upper front permanent teeth erupt on the outside of the milk teeth, looking like a double layer of teeth. What should I do if I encounter this situation? You should take your child to the hospital as soon as possible to remove the retained baby teeth to make room for the eruption of the permanent teeth. If the baby teeth are lost before they should be lost, it is called premature loss of baby teeth, which often causes the neighboring teeth on both sides to tilt toward the gap of the missing teeth, making the gap of the missing teeth smaller and the permanent teeth to erupt in the wrong place due to insufficient gap. At this time, you should wear a gap retainer (made by the hospital’s dental department) at the gap of the baby teeth to prevent the teeth on both sides from tilting, so as to maintain the proper eruption position of the permanent teeth until the permanent teeth erupt. Note 2: Is there any difficulty in the eruption of permanent teeth? If the baby teeth are lost prematurely, the child is used to chewing and licking and sucking with the dental bed, and the dental bed will become fat and obstruct the eruption of permanent teeth. Therefore, if your child has reached the age of tooth replacement and permanent teeth have not yet erupted, you should take your child to the hospital for a timely examination to obtain the doctor’s help. Calcium deficiency is also an important reason for delayed eruption of permanent teeth, so parents should give their children calcium supplements in time. When the teeth are replaced, the front permanent teeth erupt from the bottom or inside of the milk teeth, the erupted permanent teeth are the size of adult teeth, mild crowding, twisting is normal, can be adjusted with the eruption of neighboring teeth and jawbone growth and development and alignment, as long as it is not antitussive (i.e., envelope), generally do not need orthodontic treatment, but should be regularly observed, the longest should not exceed six months. If the teeth are still misaligned after complete replacement of the milk teeth, you should consult a doctor in time to avoid delayed treatment, resulting in orthodontic difficulties. Note 3: Correct the bad habits of children During the period of tooth replacement, the milk teeth and permanent teeth coexist, and the permanent teeth have just erupted, especially the “six-year-old teeth” which are the “key to bite”, with large volume and many sockets on the occlusal surface, which are easy to retain food residues, and most children do not brush their teeth thoroughly. It is often easy to occur caries. At this time, the most important thing is to teach children to brush their teeth correctly. During the period of tooth replacement, when the milk teeth are loose and about to fall off, children often use the tongue to lick the loose teeth, which is a bad habit and will affect the normal eruption of permanent teeth, and should be corrected in time. Note 4: Misaligned bite will affect the appearance of children in the period of tooth replacement, tooth replacement, jawbone development, followed by the gradual establishment of the bite relationship, sometimes there will be a temporary misaligned bite, in the process of dental development, often can adjust themselves and return to normal. Some misaligned occlusion, such as excessive gap between upper front teeth due to low position of the upper lip ligament, cannot be adjusted by itself and will affect facial development, and should be treated in hospital, otherwise it will affect the child’s appearance. Note 5: Prevention and treatment of milk molar caries The milk molar is prone to caries during the period of tooth replacement, such as caries caused by apical disease, can affect the growth and eruption of secondary permanent teeth, so we should pay attention to the timely treatment and prevention of milk molar caries, never have the wrong concept of “milk teeth have to be replaced sooner or later, there is no need to cure when they are bad”. Doctor’s advice: we should try our best to keep the milk teeth until the permanent teeth erupt, if the milk teeth are missing too early, it often leads to the secondary permanent teeth erupting gap is not enough and cause the uneven teeth. Note 6: It is advisable to eat more chewy food when changing teeth When children reach the age of six or seven, permanent teeth start to erupt one after another, replacing the original milk teeth. Some children’s permanent teeth have erupted, but the milk teeth often refuse to “give way”, forcing the permanent teeth have to grow from the inner side of the milk teeth, forming a “double layer of teeth”, resulting in permanent teeth alignment is not neat. There are many reasons for the delayed loss of milk teeth, the most common being that children eat too finely and do not give full play to the physiological stimulation of their teeth. The main function of teeth is to chew food, and chewing food can promote the growth and development of the roots of milk teeth as well as natural resorption and loss. Therefore, as children grow older, they should be allowed to eat more chewy food to maintain good stimulation of the milk teeth and encourage them to fall out on time. When your child’s incisors and posterior molars have erupted, you can add some celery, corn, apples and other foods to make the tooth replacement complete smoothly so that your child can have a mouthful of healthy and neat teeth.