Most often than not, the gum tissue around the wisdom tooth get swollen and become painful even when there is no decay found, especially when it is not fully erupted. The reason for this is varied and may be caused by constant biting of the gum tissue that grows over the tooth or by not being able to clean the area better because of a small mouth. When it causes active symptoms, the dentists perform operculectomy procedures to remove the infected tissue and create a better access to cleaning the area.