Oral surgery is when a dentist or doctor has to do a special kind of operation in your mouth. This can be for many different reasons, like taking out a tooth, fixing your jaw, or even removing something dangerous like a cancer. Some other things they might do are putting in fake teeth, fixing your gums, or making your mouth look better if you got hurt. It's like going to the dentist, but they have to do something extra special to help you feel better.