Wisdom teeth (also called dragon teeth by the djinn,) in humans are any of the third or fourth molars. Wisdom teeth usually appear between the ages of 12 for djinn. Most adults have four wisdom teeth, but it is possible to have more, in which case they are called supernumerary teeth. Wisdom teeth commonly affect other teeth as they develop, becoming impacted or "coming in sideways." They are often extracted when this occurs.
In Djinn, it represents the initiation of their powers. Once they are removed, the true life of a djinn can begin. There are also physical changes that occur after their removal. In the series, John lost his pimples, and he and Philippa both grow an inch overnight (an inch and a half in John's case). Dr. Larr noted that they were probably the youngest children to have wisdom teeth pulled out, though they are not unique among other djinn. Their father originally showed an extremely appeasing attitude to them after just gaining their djinn power.