Pearlie is a big pair of dentures that makes the wearer smile. SpongeBob wears them in the episode "Picture Day."
Pearlie has white teeth and light pink gums, similar to regular dentures. It is also very large.
Role in episode
When SpongeBob finally gets to Mrs. Puff's Boating School to have his picture taken, he is still dirty and crying. The photographer cleans him up by spraying water at him, but SpongeBob still continues to cry. Afterwards, the photographer gives him clothes and puts a Pearlie in SpongeBob's mouth, then lastly taking the picture.
When SpongeBob receives his yearbook, it turns out that all of his classmates are wearing Pearlie. SpongeBob comments "Hey! I don't look so bad after all!"