Karius and Baktus
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Karius and Baktus (ISBN 0961539410) is a Norwegian children's novel written and illustrated by Thorbjørn Egner. The book was first published in 1949 and produced as a 15 minute puppet animation film by Ivo Caprino in 1955.
The main characters are Karius (black haired) and Baktus (red haired). Their names are puns on Caries and Bacteria, and they're two small "tooth trolls" that live inside cavities in the teeth of a boy named Jens. They have a very good life, especially when Jens eats white bread with syrup and doesn't brush his teeth afterwards. Eventually their homes are destroyed by the work of a dentist and they are rinsed out of Jens' mouth through proper dental care.
The story of Karius and Baktus with its humorous illustrations and important theme have become a classic in Norwegian children's literature. Since its publication, the idea of "tooth trolls" has been used as a pedagogical device for generations of Scandinavian children.