I'm sure you have heard of the wisdom tooth. Do you know why they are so called' Well, because they usually appear during a person's late teens or early twenties, which is known as the 'age of wisdom'. They appear behind the upper and lower second molars and many times the jaws are not large enough to accommodate all of them. Sometimes, the wisdom tooth bullies the other teeth to such an extent that the doctor has to get rid of it. In nine cases out of 10, at least one wisdom tooth remains underneath the gum due to lack of space in the mouth!