Gakken Manga Series 147: The Secrets of Gum [New Edition] Publisher: Gakken Content: This book explores the secrets of gum, including its origins, ingredients, the benefits of chewing, and how it helps prevent cavities. It's a fun science picture book for children. Features: Recommended by the Japan PTA National Council and used in educational settings. Number of pages: 126 Although new, the covers are slightly worn due to home storage. Please see photos 4 and 5. Thank you for looking.