Wisdom teeth are third molars that usually develop between the ages of 16 and 24. They are commonly extracted and this is known as wisdom teeth extractions when they affect other teeth. This impaction is conversationally known as "coming in sideways." Any extra teeth are referred to as excessive teeth. Such a situation of extra teeth is known as wisdom teeth because they appear much later than the other teeth, at an age where people are wiser than as a child when the other teeth erupt.