In Western countries, there are very few people over the age of 20 with misaligned teeth because the entire society is focused on dental care and children are motivated to get orthodontic care from an early age. In Japan, November 8 every year is designated as the national orthodontic day, the proportion of children aged 12 to 15 years old orthodontic teeth up to 50% or more; many parents in the United States also have a consensus that the child’s teeth are not straight, if not sent to do orthodontics, it is like not allowing the child to go to high school, is irresponsible to the child. In China, however, children’s dental problems are still not taken seriously by more than 70% of parents. The following is a detailed explanation of children’s orthodontic related issues, I hope that the majority of parents will help. First, the harm of children’s uneven teeth: 1, affect the facial appearance. 2, because the upper and lower bite relationship is not good, it will affect eating, chewing function decline, increase the burden on the stomach and intestines, thus affecting physical health. 3, sometimes also affect the pronunciation. 4.Uncomplemented teeth can easily lead to unclean brushing, so it is easy to grow caries and tartar, which affects teeth and periodontal health. 5, some children and adolescents because of bad teeth, by classmates or small friends of the ridicule, and thus become inferior, affecting mental health. Second, children’s orthodontic methods: 1, movable aligners: generally used in the period of milk teeth and teeth replacement of the relatively simple orthodontic malocclusion, or with fixed aligners for orthodontic treatment. Patients can take off and wear themselves. 2, functional braces: mainly used in the period of teeth replacement or just after the replacement of teeth is still in the growth spurt of children, the use of functional braces can correct bony malocclusion. 3, fixed braces: the most commonly used orthodontic appliances. Patients can not take off and wear themselves. 4, orthognathic surgery: severe malocclusion, such as maxillary protrusion, maxillary recession, mandibular protrusion, mandibular recession, simple orthodontics can not be resolved, it is necessary to combine surgical and orthodontic treatment method. Third, the time required for children’s orthodontics: general orthodontics takes about one and a half to two years. Generally children are faster than adults, extraction treatment than non-extraction treatment time is longer. Complex errors and malformations than simple errors and malformations treatment time is longer. Skeletal malformations take a little longer to correct than simple dental malformations. Each person’s situation is different and should be analyzed on a case-by-case basis, and the treatment time should also be analyzed on a case-by-case basis. After the completion of orthodontics, generally need to wear retainers for about a year and a half. Fourth, the best time for children’s orthodontics: general dental malformations, the best time for orthodontic treatment is the early permanent teeth (i.e., twelve, three years old), because this time children just after the replacement of teeth, and in the more vigorous growth and development. As for functional malformations, since they often appear during the period of the replacement of teeth (i.e., 6-12 years old), if orthodontic treatment is delayed, they may develop into bony malformations, so the best time for orthodontic treatment should be during the period of the replacement of teeth. As for the correction of bony malformations, orthodontic treatment should be performed when the child is in the pre-growth phase (10-12 years old for girls and 11-13 years old for boys). One exception is the anterior teeth backbite (commonly known as “diastema”). This malformation has a more serious impact on the jaw development of children and should be corrected immediately once it occurs, the earliest correction can start around 3.5 years old. It usually takes only 3-6 months to nudge out the supra-mammary anterior teeth that are back-biting on the inside of the lower jaw teeth.