If the operation is done properly, there is no postoperative complication, there is no great harm. Clinically, such a situation is seen in two kinds: one is four wisdom teeth, many people will grow four wisdom teeth, but four wisdom teeth long position are not too good, then you need to four are extracted, four extractions after the patient does not have a great impact. The other most common clinical situation is orthodontic extractions, where the first or second bicuspid is extracted, and all four are removed, upper, lower, left and right. This is a very mature extraction method in orthodontics, which itself is not very harmful when orthodontics is performed after the extraction. It should be noted that since people are chewing more and more delicately nowadays, the amount of teeth is relatively large, according to which the extraction of four teeth, minus the amount of teeth will make the teeth look neater.