Ahya has a toothache. Heavenkid shrinks his body to enter Ahya’s mouth. Heavenkid tries to stop tooth worms from digging Ahya’s dental caries, but he fails to do so, and is in danger. Cloud Fairy comes to the rescue of Heavenkid, and gives him a magic tool. With that, Heavenkid and ToTo finally defeat the tooth worms. This story reminds children to cultivate the good habits of hygiene and cleanliness.