According to your description, pericoronitis is caused by wisdom teeth. Cleaning teeth in the hospital refers to cleaning the dirt around the gums and applying medicine. If it hurts for a long time, I suggest removing it. You don't have to worry or be afraid. When you take it out, you will be anesthetized, and then you won't feel any pain. It's all about doctors, but you will feel a little shocked when you knock at the door. Usually go to the hospital.