I have really long + straight hair and i cut a bit a shorter and there is a wave right in the middle

i tried everything!

i didn't tie my hair and i washed it and the wave is still there :( any reasons or suggestions to help me get rid of it ?

I have really long + straight hair and i cut a bit a shorter and there is a wave right in the middle!?

This happened to me too. But, when you cut it shorter, it took off some of your hair's weight, which was straightening the wave. Try using a hair straightener like the Remington Wet 2 Straight. I use it and my hair is really straight afterwards. Here is a link:

http://www.target.com/gp/detail.html/ref...

That straightener works like a hairdryer as well. You can use it even when your hair is wet. I, though, have found that it works better if you straighten it when it is damp or dry.

I have really long + straight hair and i cut a bit a shorter and there is a wave right in the middle!?

Try straightening you hair with a straightening iron. Some times hair just naturally does that because of external reasons (i.e. weather).