Many traditional ideas that “only after the age of 12 to orthodontic”, which makes many parents tangled, hesitant, but follow the analysis of modern clinical medical science, 19 kinds of dental malformations or abnormalities must be found before the age of 12 that correction, do not hesitate: a serious big buck (violent) teeth buck teeth patients are very unconfident, so afraid to communicate with others, dare not smile, greatly affecting school, some children become inferior. They do not dare to smile, which greatly affects their schooling and social life, and some children become inferior, which should also be corrected in time. Serious tooth crowding during the period of teeth replacement Third, the anti-dentition is commonly known as “envelope”, that is, the lower row of teeth wrapped around the upper row of teeth. It seriously affects the beauty of the face, leads to eating, chewing function decreases, increases the gastrointestinal burden, thus affecting health. Sometimes it also affects pronunciation, ridicule and psychological health. Four, deviated jaw Due to the tooth decay or missing on one side, eating with the other side for a long time or other reasons, resulting in bilateral face shape asymmetry, which seriously affects children’s mental health and self-esteem. Fifth, receding jaw underdeveloped chin, small chin, commonly known as bird’s mouth. It affects the facial beauty, and also affects the function because the lower row of teeth is too narrowly aligned, which restricts the development of the upper row of teeth. Premature loss of baby teeth Premature loss of baby teeth before the replacement time will cause the local jaw bone to be underdeveloped, and the position of missing teeth may be partially or even completely occupied due to the displacement of neighboring teeth, resulting in the misalignment of permanent teeth eruption or ambush obstruction and the formation of dental malformation. 7. Retention of milk teeth The milk teeth are not shed and recede by the time of replacement, resulting in the eruption of the succeeding permanent teeth being obstructed, with abnormal eruption order, or misplaced eruption, or ambiguous obstruction, resulting in malocclusion and malalignment of teeth. Open mouth breathing during sleep This condition is mostly caused by nasal blockage or adenoid hypertrophy, which can lead to lip ectropion and short and thick lips, high arched palate, narrowing of the face, protrusion, long face, receding chin and inability to bite together the back teeth. Nine, multiple teeth in the oral cavity, especially the upper incisors have extra teeth. Most of the extra teeth are malocclusions, which occupy the position of normal teeth, resulting in misalignment or eruption disorder of these normal teeth. Ten, permanent teeth do not erupt or ambiguous obstructive obstructive teeth are teeth that partially erupt or completely fail to erupt and cannot erupt later. It is common in incisors during childhood. It can be improved by aiding eruption or traction. Snoring during sleep Snoring can lead to facial deformities, such as narrow face, exposed lower teeth, open lips and exposed teeth, due to nasal obstruction, incorrect breathing and incorrect bite of upper and lower teeth, which can seriously affect the appearance of children. Twelve, decayed teeth are not repaired in time The position occupied by the baby teeth due to decay becomes smaller, which will make the permanent teeth erupt without sufficient position, so there is crowding and misalignment, and even affect the replacement and eruption of the inherited permanent teeth. Therefore, it is necessary to fill the decayed milk teeth. Abnormal labial tethering The labial tethering is attached between the lateral gingiva and alveolar mucosa between the two incisors in the middle of the upper row, and if the tethering does not recede with age, it will lead to a large gap between the upper incisors. XIV. Abnormal lingual tethering Congenital developmental abnormalities. The tongue tether is too short, so that the normal movement of the tongue is restricted, and in severe cases, the tongue cannot be extended outside the mouth or cannot touch the upper lip. It affects sucking, phonation and pronunciation. Fifteen, after cleft lip and palate surgery After cleft lip and palate surgery is not all right, but must also need a series of orthodontic treatment for several years in order to maximize the good appearance and physiological function. Sixteen, bad lip habits include biting the lower lip, sucking the lower lip, lower lip pocketing the upper lip, etc. This will cause the upper lip to be too short, open lips and teeth and the lower lip to be sunken in. Seventeen, bad finger-sucking habits children after the age of 3 still persist in finger-sucking behavior, will cause the front teeth do not bite together, children’s upper and lower incisors protrude and other deformities, serious cases may affect the upper and lower skeletal development and cause facial deformities. Eighteen, bad tongue habits tongue extension, tongue spitting, tongue licking, tongue topping, etc. are bad tongue habits, which can cause teeth outward misalignment, protrusion, gaps, teeth bite not close together or the ground, etc., must be corrected in a timely manner. Nineteen, early loss of permanent teeth The first permanent molars that children grow, that is, the first major molars. Each person has a total of four upper and lower left and right. Generally speaking, these teeth erupt at the age of six, so they are commonly known as “six-year-old teeth”. The decay rate of “sixth age teeth” is the highest, and the percentage of extraction and the incidence of other dental diseases are higher than other teeth. In terms of function, this tooth is the most important molar, and the loss of the sixth age tooth will easily lead to misalignment of teeth, and the orthodontic treatment will be much more difficult, so we should pay special attention to the protection of the “sixth age tooth”.