Student or Learner
I don't know which preposition to use in this case:
We use this tool to flatten the dough/ for flattening the dough. (The second one sounds strange to me, but we use the question "What do we use it for", so it confuses me!!
Thanks a lot
Not a teacher.
Either way is fine. "To flatten" is probably more natural, but "for flattening" is also correct.
(The more common phrase would be to say "rolling the dough" rather than flattening.)