Maisy's friend Charley has a wiggly tooth! He's going to the dentist for the first time, and he's a little nervous. Luckily, Maisy, Tallulah, Eddie, and Cyril are happy to accompany Charley to the dentist's office, where they make some fun discoveries: a twirly chair that goes up and down, a special cup to spit in, and a proper tooth-brushing demonstration. Charley gets an X-ray, a smiley button, and a book to take home, but what will happen with his wiggly tooth?