Human teeth are mainly divided into milk teeth and permanent teeth, milk teeth usually have 20 teeth, which start to erupt at the age of 6 months and can grow in two to three years old; while permanent teeth have 28 to 32 teeth (the number of wisdom teeth is usually 0 to 4), usually around the age of 6 years old when the tooth replacement period begins, the advent of the tooth replacement period symbolizes the child into another stage of growth, as a parent you must be full of expectations; but at the same time, you and your child must also be full of various You as a parent must be full of anticipation; however, at the same time, you and your child must be full of various doubts. In general, there is a rule for tooth replacement, which simply means “left and right symmetry, lower first and then upper.” At the age of 5 to 7 years old, the milk incisors (incisors) in the lower jaw begin to shake and fall off, 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 in the same position only after their loss. 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. Some people do not have the third molar is also a normal phenomenon. Second, there is no “replacement” of the “six-year-old teeth” which one is? When a child reaches about six years old, the first permanent molar, also known as the “sixth-age tooth”, will grow quietly behind the last milk molar on the upper and lower left and right. Many parents do not know its existence, and even think it will be replaced, so they neglect to take care of it, resulting in many children’s sixth-age teeth start to decay early. Parents must pay attention to it! After this tooth erupts, you must pay attention to clean it and have the sulcus closed in time. Why the newly erupted incisors are jagged? New incisors are jagged when they first erupt. Serrated” is a nodule in the development of teeth, which will be gradually smoothed with eating and chewing, this is not an abnormal situation, no need to deal with. Fourth, the upper incisors are outwardly “eight” after eruption, do I need to wear braces? As the embryos of the two lateral teeth that have not yet erupted squeeze the roots of the large incisors, the newly grown incisors will show an external “eight”, this “ugly duckling” stage is only a transitional period, with the eruption of the lateral teeth, the temporary “abnormal” will disappear naturally. Five, the child’s lower row of new teeth has grown, but the old teeth have not yet fallen out, “double row of teeth”, what should I do? Children’s diet is characterized by too fine food, which often leads to new teeth erupting from the inside before the milk teeth fall out on their own. Generally speaking, if the new teeth erupt a lot and the baby teeth are still not loose, it is recommended to remove the baby teeth and the new teeth will adjust to the normal position by themselves. 6. Do the newly replaced teeth need orthodontic treatment if they are misaligned? Since the permanent teeth are larger than the baby teeth and the jawbone development is not completed, the permanent teeth may not have enough space when they come out and the arrangement becomes crowded. However, the alignment of teeth can usually be determined only after all the baby teeth have been replaced by permanent teeth. If you are in doubt, consult your dentist. 7. Why are the newly replaced teeth so yellow? Are they not well developed? It is normal for the newly grown permanent teeth to be more yellow than the baby teeth. This is because the permanent teeth are more calcified than the baby teeth, which means that the outermost enamel of the permanent teeth is more transparent than the baby teeth, so the inner layer of yellow dentin can be easily penetrated. However, if the tooth discoloration is severe, please consult a dentist to identify it. There are 6 things to pay attention to during the tooth replacement period 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 coming in next to the baby teeth but the baby teeth have not fallen out, 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. 3, some parents think that when children change teeth, give them to eat fine, fine, soft food can protect the newly erupted permanent teeth. I do not know, if you just 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 labial side of the milk teeth, forming a “double layer of teeth”. The actual fact is that you will be able to get a lot more than just a few of the most popular and popular items in the marketplace. 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 surface layer of newly erupted teeth is not sufficiently calcified, the acid resistance is poor, and it is easy to be decayed. Parents should take their children to the hospital to have their new permanent molar teeth closed within one year after eruption to prevent decay. Vulval closure is the most economical and effective method to prevent tooth decay. 6.To take good care of the child, try to prevent the 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, so that the tooth can be reimplanted and fixed. The child’s tooth replacement period is also called the “ugly duckling” stage. Some physiological irregularities will adjust on their own, and when all the replacement is completed, the child will be transformed into a “white swan”. However, there are some dental conditions that are abnormal and require timely intervention, so it is recommended that you take your child to the dentist regularly so that problems can be detected and dealt with early.