Why do we have wisdom teeth? Although formally known as 'third molars', we know them as wisdom teeth. They are called that because they appear much later than the other teeth, at an age where people are presumably "wiser" than as a child, when the other teeth come in. It is thought that wisdom teeth used to help us in grinding down plant tissue when the skulls of human ancestors had larger jaws with more teeth. As human diets changed, smaller jaws gradually evolved, yet the third molars, or "wisdom teeth", still commonly develop in human mouths. The wisdom teeth are the last to come through, at the back of the jaw. They usually appear between the ages of 17 and 25 but can sometimes appear many years later. Today many people have a jaw that is too small for...