Maisy's friend Charley has a wobbly 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 their toothy friend 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 wobbly tooth?
Since he's a mouse, Doctor De Soto refuses to treat "dangerous" animals--that is, animals who have a taste for mice. But one day a fox shows up and begs for relief from the tooth that's killing him. How can the kindhearted De Sotos turn him away? But how can they make sure that the fox doesn't give in to his baser instincts once his tooth is fixed? Those clever De Sotos will find a way.
William Steig's Doctor De Soto is a 1982 New York Times Book Review Notable Children's Book of the Year and Outstanding Book of the Year, a 1983 Boston Globe - Horn Book Awards Honor Book for Picture Books, and a 1983 Newbery Honor Book.