Harald Hårdtand: Kampen om de rene tænder (or Harold Hardtooth in The Fight for Clean Teeth) or simply "Colgate" for short, is an advergame platformer released in 1992 for the C64, Amiga and DOS. The game was developed by SilverRock Productions, a Copenhagen-based Danish company founded in 1988 and renamed in 1992 to Interactive Television