Many patients and parents preparing for orthodontic treatment face a difficult problem, that is, why orthodontic treatment often requires tooth extraction? They do not understand this, worrying that orthodontic treatment will have a negative impact on the future, they are very hesitant, and even give up the orthodontic treatment of teeth. In fact, tooth extraction is a means of dental orthodontic treatment, especially for patients with crowded teeth and pronounced facial protrusion of teeth, because nowadays people’s food is relatively fine, i chewing power to stimulate jawbone development is not enough, and the number of teeth size is set before birth, so it produces the teeth and jawbone incongruity, the performance is crowded teeth, protrusion, misalignment, buried, etc.. The main purpose of orthodontic extraction is to provide sufficient space for the teeth to align the crowded, protruding, misaligned, and buried teeth, to coordinate the upper and lower jaw teeth, and to better adjust the bite relationship and facial shape. In general, for mild crowding (crowding degree less than 4 mm), limited space can be obtained by enlarging the dental arch without extraction; for moderate and severe crowding (crowding degree 5-9 mm and above), most of the teeth should be extracted to obtain space; for misaligned jaws with anterior protrusion and no space in the dental arch, space also needs to be obtained by extraction. It is important to look at the doctor’s skill level, which teeth to extract, and how well the orthodontic treatment is done after the extraction. Generally, the orthodontist prefers the diseased teeth and the teeth that have the least impact on the chewing function in orthodontic extractions, and the maxillary and mandibular jaws are considered as a whole, with a detailed design plan of what results may be achieved, etc. For patients who need to extract teeth, generally it will not affect the function of chewing and so on. Moreover, through the orthodontic treatment, the bite relationship is better, the function of the teeth is enhanced instead, the aesthetics is better, and the life span of the teeth is extended, so please do not worry too much about the patients and parents who need to extract teeth for orthodontic treatment. Of course, extraction orthodontics is a strict indication, not all orthodontics to extract teeth, can achieve good results without tooth extraction or can not easily remove teeth, and orthodontics itself is a highly technical treatment, so to achieve the goal of beautiful and stable coordination of teeth after orthodontic treatment, choose to the regular medical sector, looking for orthodontists with orthodontic treatment technology qualification is It is necessary.