Eating candy lures tooth trolls, which drill holes into teeth and look scary.
It is not clear whether the tooth troll is a single entity, or if there are many.
The fictional character Hammaspeikko is an adaptation from the Norwegian book Karius og Baktus written by Thorbjørn Egner published in 1949.
The book was translated in Finnish as Satu hammaspeikoista ("A Tale about Tooth Trolls") and published in 1961.
You can help Wikipedia by expanding it.This article relating to a European folklore is a stub.