2) INTO = movement towards the inside of something; ONTO = on after a movement; the two prepositions follow and indicate a movement or a direction.

Which is correct into or onto?

For your sentence, into would be OK if you were to say: I bite the gingerbread man and his head rolls into my mouth. We use on when something is in contact with something or makes contact with it. We use onto only when something makes contact with something.

How do you use into and onto?

Onto, or “on to”? Into and onto are prepositions, words that describe relative position. They are part of prepositional phrases, such as “She settled herself into her seat” or “He climbed onto the roof.” These words are forward looking, in that, as their grammatical name implies, they are positioned before the object.