More and more people are now seeking orthodontics, but are deterred by the thought of extractions. Why do some patients have to have certain teeth extracted when they are orthodontic? Let’s discuss this question from the following aspects. The teeth that are usually extracted during orthodontic treatment are wisdom teeth and bicuspids. Wisdom teeth are a hidden problem if they do not grow in properly and should be extracted whether orthodontic or not. Bicuspids are also usually extracted during orthodontic treatment. Removing bicuspids not only does not affect the aesthetics, but also provides favorable conditions for orthodontic treatment. The purpose of orthodontic extraction is mainly three: 1, uncrowding: the space after extraction can align the crowded teeth, so that the teeth and the amount of bone in harmony, so as to achieve the effect of aesthetics. 2.Improve facial shape: For example, patients with protruding facial shape (such as buck teeth) can improve their facial shape by extracting the gap to collect the whole front teeth backward. 3.Adjust the bite relationship: When the teeth bite relationship is not good and the upper and lower teeth are not coordinated, sometimes it is necessary to extract some teeth and adjust the teeth to establish a functional and stable bite relationship. In short, according to different orthodontic patients we should take different orthodontic treatment plans, patients who need to extract teeth should be extracted, so as to achieve the goal of balanced, stable and aesthetic orthodontic treatment.