This animated film is adapted from a fairy tale by Norwegian children's author Thorbjørn Egner. 　　If children eat sweets before going to bed at night and don’t brush their teeth after waking up in the morning, Little Red Face and Little Blue Face (scientifically known as Lactobacillus, a type of bacteria very harmful to teeth) will seize the opportunity to gnaw away at their teeth. Xiao Ming is a child who loves eating sweets before bed and dislikes brushing his teeth in the morning. Naturally, Little Red Face and Little Blue Face didn’t let him off—they seized their chance to enter Xiao Ming’s teeth, turning them into a playground and causing him great suffering. However, aside from these two flaws, Xiao Ming is also particularly forgetful. As soon as his toothache subsides, he immediately forgets all about Little Red Face and Little Blue Face. It’s only at the very last moment that he finally resolves to drive those pesky creatures out of his teeth.