The need to extract teeth for orthodontics is not a question of whether it is good or not, but a question of having to extract teeth after being judged by a professional orthodontist, and if it is possible not to extract teeth, generally orthodontists do not strongly recommend the extraction of teeth. At present, the main theoretical basis of orthodontics requires tooth extraction is because the food chewed by people nowadays is becoming more and more fine, and the jawbone is developing smaller and smaller, while there are still more teeth, 28-32 teeth, all the teeth have to erupt, and the jawbone does not have the corresponding position to accommodate their eruption, which will cause crowding, at this time, if the teeth are not extracted, orthodontics will not be completed, on a crowded dental row The orthodontic treatment can not achieve better results, so the orthodontist needs to extract teeth, is the orthodontist must do after professional judgment, and there is no question of whether it is good or not.