In fact, not all orthodontics require tooth extraction, but there are different situations. Secondly, why do some orthodontics need tooth extraction? Tooth extraction is a common phenomenon in orthodontics, but not everyone needs tooth extraction in orthodontics. The crowded dentition can also be corrected by the method of not extracting teeth. For example, the adjacent surface is glazed, which makes the gap between two teeth bigger and makes room for the teeth to align; You can also align the front teeth by pushing them back, depending on the situation. Of course, severe congestion still needs tooth extraction to get better correction effect. At present, the technology of tooth extraction correction is very mature, so don't worry too much. Correction often requires three films to be diagnosed in advance: curved section, skull positioning lateral position and skull positioning orthodontic extraction evidence: 1. Extra teeth, buried teeth that can't be pulled out, wisdom teeth that cause crowded posterior teeth, etc. If the dentition is more than 2 degrees, the corresponding gap cannot be obtained by other means. If the dentition is crowded, you can get space in other ways. It is necessary to decide whether tooth extraction is needed according to the type of bone surface and bimaxillary protrusion. The soft tissue curve has obvious protrusion (the apex of the upper and lower lips is far in front of the E-line), and the bimaxillary protrusion needs to be removed and corrected by cephalometric lateral film (Peking University analysis method, Kuben analysis method). Whether the upper and lower incisors in this area should be pulled out is really inconclusive, which varies from person to person and from doctor to doctor. In other words, not every patient needs to have his teeth extracted or not. The same patient may get different answers when he goes to different doctors for correction, depending on the doctor.