Flatter hair?

Just brush it a lot. And run your brush under water. That helps, too. I know because I have the same problem, lol.

Why have you asked the same question twice?

Stay out of humid places, and if naturally you have curly hair or poofy hair chances are straightening it is not going to help but if you put a pea sized portion of conditioner (like pantene or head and shoulders) in your hair before you straighten it or after you get out of the shower just rub some into your hair and blowdry then straigten it should work.

Well when mine gets that way I get my brush and spay hair spray on it then brush it through my hair it works well for me.good luck: )