It is very important to protect the milk teeth, don’t think that the milk teeth will not be protected if you want to change teeth in the future, many children don’t brush their teeth and sleep after eating milk, so it is easy to form caries, serious caries will cause premature loss of milk teeth, which will cause unevenness after changing teeth, so it is very important to protect the milk teeth. Therefore, it is very important to protect the baby teeth. Also, proper chewing will stimulate the jaw bone and help to reduce the malocclusion in the future. Some bad habits can cause serious malocclusion and should be corrected as soon as they are discovered. Orthodontic treatment is commonly understood as wearing braces to align the misaligned teeth, many parents think that this is just for the sake of beauty, but in fact it is not true. Many parents think that good oral hygiene can be maintained with good brushing, but this is not true. Misaligned teeth leave a dead space for cleaning, an area that cannot be reached by a toothbrush, and even with careful brushing, it is difficult to remove the plaque, and this is where the need for orthodontic treatment comes in. The advantage of early treatment for children is that children are in the growth and development period, with active physiological alteration, good treatment effect and faster tooth movement than adults, and the neurological system of children is in the development stage, so they have better adaptability than adults to the discomfort that orthodontic treatment may cause. Orthodontic treatment usually starts at the early stage of permanent dentition, around 10-12 years old. One point worth stating is that for problems with obvious skeletal deformities and deformities affecting jaw and facial growth and development, early orthodontic treatment is needed, and for whether orthodontic treatment is needed, a professional orthodontist needs to be consulted so as not to miss the best treatment period.