Where, Oh Where, are Missus Hattie's Teeth? Megan has just discovered that the tooth-fairy doesn't give new teeth to old people when they lose their old ones. It is time for Detective Smarkles to put on her thinking hat and get to the bottom on this mystery. In the process of learning the truth, she discovers the different ways the tooth-fairy could possible use the teeth she collects and the importance of dental hygiene. Another mystery for Detective Smarkles to solve.