Extraction of teeth is one of the steps to correct teeth. According to the doctor's plan, the teeth are extracted in batches and then divided. Some teeth are separated at the same time when teeth are extracted, and some teeth are separated after tooth extraction. It usually takes about 65,438+0 weeks to cover the upper, lower, left and right teeth. The purpose is to move the teeth out of the gap, so that when wearing braces, the steel ring that fixes the braces can be put in. After the teeth are separated, you can usually put on braces directly.