A wisdom tooth is considered impacted when it is submerged under gum tissue or bone and unable to erupt into position. Based on the type and amount of overlying tissue, impactions are classified in a few different ways. Soft tissue impactions occur when a wisdom tooth remains covered by gum tissue. If a wisdom tooth remains completely or partially obstructed by bone, it's known as a bony impaction.
Impacted wisdom teeth can potentially cause many problems and may need to be removed when they are the source of: