How much "bend" are we talking about? 1 - 2 mm or so, you are probably - (disclaimer, PROBABLY) - fine to just manually bend it back in place.
Anything more, I would suggest heating it to a dull glow, then quench in water. Brass being a non-ferrous metal, responds oppositely to the way ferrous metal (ie, your knife blade) does when heated and quenched. A knife blade get harder by heating/quenching, brass gets softer.