How do you straighten your hair without a straightener?

You put a round brush thingy underneath, then you blowdry, right?

And what is the best product for frizzes after straightening without straightener?

I have naturally curly hair.

Thanks!!

P.S. I asked this question here because I thought I would get more answers from teeangers with this experiences.
Update: Guys, you have this experiences. Which one is the best for you: Straightener or blow dry to straighten the hair?!
Update 2: When you straighten your hair, is it same as blow drying to straighten?
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