Nemo wants to have his teeth cleaned. Why? He is going to have his picture taken. Before the dentist can clean his teeth he has to check for cavities. To do this he uses a special kind of photography. Special film is put into Nemo's mouth and then a machine emits X-rays through his cheek. The X-rays pass though his face and teeth and when they reach the film, they leave an image of the inside of Nemo's teeth. He has no cavities.
Wait! The dentist decides that Nemo has such beautiful teeth that he decides to keep Nemo in his fish tank.
The kids at Bikini Bottom are never going to believe this!