Incredible adventures in the Tooth Kingdom by Dinara Akbaya
Tim loves sweets, but doesn't like brushing his teeth. He magically ends up in the tooth kingdom, where bacteria and microbes live. King Drakaries lures him to his castle and asks Tim to help him catch his main enemy. When Tim finds out that this enemy is his best friend Jim, he decides to escape from the castle. In this he is helped by the spy of the kind King Emalius. Tim finds Jim and together they go in search of the almighty wizard imprisoned by the evil king. On the way, they have to go through many tests, solve riddles, show courage and dedication.