"Narwhal and Jelly learn a thing or two about tusk-tooth dental hygiene . . . and feelings! Everyone knows that Narwhal is a big fan of sugary treats--but Jelly is shocked when Narwhal's tusk-tooth isn't looking so pearly white anymore. Thankfully, no one knows more about dental hygiene than Shark--he has seven rows of teeth, after all! Meanwhile, Jelly and Crab try to teach Narwhal that it's fine to frown if you're feeling down. Can Narwhal's friends...

"Narwhal and Jelly become the coolest teachers in the world wide waters in the hilarious sixth book of this blockbuster graphic novel series! Dive into four new stories about Narwhal and Jelly becoming substitute teachers! The two best friends come across an enthusiastic school of fish one morning. Unfortunately, Mr. Blowfish, their teacher, has come down with a cold, and class will have to be cancelled . . . until Professor Knowell (Narwhal) and...