I have bent several beading needles and have straightened them with pretty good success. I learned this from my grandma, who went through the depression when you threw NOTHING away until you couldn't use it anymore. :-)
First I try to bend them back in shape by holding them with a pair of chain-nose pliers and reshaping with a pair of bend-nose pliers.
Then I take them to my metal block and 'gently' tap them several times with a small hammer. I rotate them as I tap.
The hammering seems to strengthen the metal.
Of course they are not perfectly straight, BUT I can still use them. I've done this several times with the same needle before I finally throw them away. AND always wear safety glasses when doing this procedure. Hope this helps. :-)