People have to grow teeth twice in their life, that is, milk teeth and permanent teeth. There are 20 milk teeth, which usually start to erupt around 6 months old and grow all the milk teeth at 2-3 years old; 28-32 permanent teeth, of which the number of wisdom teeth is 0-4. I. When babies change teeth Under normal circumstances, at the age of 5-7 years, the milk incisors (central incisors) in the lower jaw begin to shake and fall out, and soon, permanent incisors grow here; at the same time, the first permanent molar grows behind the second milk molar. Thereafter, other teeth are replaced one after another. The single cusp and bicuspids of the permanent teeth also grow out after the loss of the milk teeth in the same position. Until the age of 12 to 13, all the milk teeth are lost and the permanent teeth are replaced. After that, the permanent teeth come out alone: the second molar grows behind the first molar at the age of 12 to 14, and the third molar grows after the age of 18. It is normal for some people to have no third molar. The order and time of tooth replacement is roughly as follows: 4 milk incisors 5 to 7 years old 4 milk lateral incisors 8 to 9 years old 4 first milk molars 10 years old After tooth replacement, it is called the first bicuspid, or the first premolar 4 milk cuspids 11 years old 4 second milk molars 12 years old After tooth replacement, it is called the second bicuspid, or the second premolar 4 new first permanent molars 6 years old 4 new second permanent molars 12 to 14 years old 0 to 4 new third permanent molars During the tooth replacement period, there are 6 things to pay attention to 1. Pay attention to the growth of your child’s baby teeth and permanent teeth, and visit your dentist regularly so that problems can be detected and solved early. If you find that permanent teeth are growing next to the baby teeth but the baby teeth are not lost, forming a double row of teeth, parents should take the child to the hospital as soon as possible to remove the remaining baby teeth. In addition, if the gap between the maxillary incisors is too large, malformed teeth grow out from the upper incisor position, or one incisor grows out from an abnormal position, this indicates that there may be a case of multiple teeth growing in one place and should be seen in the hospital. 2. Supervise children to brush their teeth every day, once in the morning and once in the evening, to prevent tooth decay. Children should brush their teeth with special toothpaste and toothbrush for children, and brush their teeth in the right way for about two to three minutes. In addition to brushing, children should rinse their mouths after eating food each time to maintain oral hygiene. The correct way to brush teeth and steps: 3. Some parents think that giving their children fine, fine, soft food can protect the newly erupted permanent teeth when they are changing teeth. I do not know, if you eat soft food, lack of chewing food stimulation, but will affect the development of the jawbone, resulting in breast teeth “occupy”, forcing permanent teeth have to grow from the lingual or lip side of the milk teeth, the formation of “double teeth”. The actual fact is that you will be able to get a lot of hard foods, such as beef, carrots, celery, corn, etc., and occasionally chewy foods such as jellyfish, peanuts, and beans. In addition, let your child eat more hard food, food containing less sucrose, fruit not peeled into small pieces, and less snacks. 4, timely correction of some of the child’s bad habits, such as spitting and biting the tongue, biting fingers or pencils, licking teeth with the tongue, etc., these bad habits can affect the growth of children’s teeth, resulting in tooth deformation. 5, to protect the child’s first permanent molars around 6 years old. Because the newly erupted teeth have insufficient calcification, poor acid resistance and easy to decay. Parents should take their children to the hospital to do the sulcus closure within one year after the eruption of the new permanent molar to prevent decay. Vulval closure is the most economical and effective method to prevent tooth decay. 6.Take good care of the child and try to prevent tooth loss caused by trauma. If the tooth surface is dirty, rinse off the dirt with water immediately and put it into milk or water to the hospital as soon as possible, and the tooth can be fixed by replanting. Third, the replacement teeth are not aligned, the gap between the teeth need to be corrected? After the replacement of the front incisors of children, often not very neatly aligned, parents are very anxious, do not know whether they need to correct, in fact, the front incisors just after the replacement of some crowded is a normal physiological phenomenon. The reason is that children’s bones are relatively small, and bones will continue to grow larger with age, and the size of the replacement incisors will not change with age, so there will be a temporary crowding, and due to the extrusion of the adjacent teeth eruption on the incisors (the gap between the teeth during the period of tooth replacement, usually with the other teeth after the crowding accounted for recovery), often cause the skewed incisors, twisted, the period of the front teeth area teeth do not look so neat and tidy. This period of time is called the “ugly duckling period” by scholars of pediatric dentistry. Most of these conditions will improve as children grow older and their skulls develop. However, the following conditions require correction: 1. Severe skeletal deformities of the maxilla or mandible, such as excessive anterior protrusion of the front teeth, lip protrusion, etc. 2, bad habits seriously affect the development of teeth and jaws. Such as biting the lower lip habit, finger eating habit, mouth breathing habit, tongue spitting habit. 3.Serious misalignment of individual teeth, such as twisted teeth; individual teeth reversal (the upper teeth bite inside the lower teeth). 4. Recommended children’s songs for brushing teeth “Gargle” Hold a flowery cup in your hand, drink clear water. Hold the water, close the mouth, gurgle, gurgle, spit out the water. I can brush my teeth” Small toothbrush in my hand, open my little mouth. Brush the top teeth down, brush the bottom teeth up, brush the left, brush the right, brush the inside and the outside. Brush in the morning and brush at night, so that there are no cavities. After brushing your teeth, smile and reveal your white teeth. In addition, Fan Xiaoxuan’s “Brush Your Teeth Song” is also a good recommendation.