Teeth straightening is also known as orthodontics. It is a kind of oral operation to make the teeth in our mouth as straight as possible by wearing orthodontic arch wires, and to make our face shape, especially the side shape, more beautiful. It is up to the orthodontist to decide whether or not extractions are needed. Normally, the orthodontist will decide whether extraction is needed based on the patient’s facial shape, dentition, and imaging. However, due to the development of teeth in people nowadays, most people nowadays need to have their teeth extracted before orthodontics, this is due to the fact that the amount of teeth we have is on the high side for the amount of jawbone we have. When all of our teeth are erupted, it causes the lower third of our lateral facets to become convex. Simply put, we would be like monkeys and orangutans. The arch of the jaw will be very large and the mouth will look very protruding. And in this case, if we want to retract the mouth back. Then the teeth must be extracted to reduce the amount of teeth, and then orthodontics can be applied to adjust the entire facial shape to a more beautiful position.