Most people get four wisdom teeth, but it is possible to get less or even more. They are the last molars in the back of the mouth top and bottom. Wisdom teeth appear between the ages of 17 and 25. When they come in they push other teeth or come in sideways. There often isn’t enough room for wisdom teeth as our jaws have evolved smaller and can not accommodate so many teeth. These are the last to come in and there are usually problems. Very few people ever get to leave their wisdom teeth intact.
For about third of the population, wisdom teeth do not occur.