Karius og Baktus was written by Norwegian author Thorbjørn Egner and first published in 1949 as a children's story about dental hygiene. The two trolls live inside the teeth of a boy named Jens, thriving on sugary food and dreading the toothbrush and dentist. Ivo Caprino's 1955 puppet film helped fix their voices in Norwegian popular culture. Generations of children learned brushing habits from their songs, and short chants like this one now circulate online as a nostalgic, instantly understood symbol of craving sweets and asking for food.