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Well my hair is naturally very curly so iv asked some people that same question and they said that the product i use isn't working so try different products after and before u straighten it ok well thanks 4 asking

Well what temperature is your flat iron on? I use mine on 400 when I want it really straight and it stays straight throughout the whole day. My hair is INSANELY curly, so it should work for you too. When I used it on a lower heat (250-300) it did become wavyish during the day but then i started to use it on the highest heat and use heat protectant before I straightened it and now it stays straight and healthy(:

there is this hair product that is called Suddenly Straight.

TO use: once out of the shower towel dry your head. after that distribute it evenly throughout the hair. You can either use a straightener or a blow dryer to straighten it. I suggest using the CHI straightening iron when hair is dried. also it was voted best kiss by Cosmo Girl, so that means a lot of people like it and irts really good.

watch this: http://www.youtube.com/watch?v=3cwsITBv_20

My hair used to do that. But I have a little regimen now :

Section my hair in threes : bottom layer, middle and crown.

Round brush and blow dry using Ice Mousse by Pantene.

Use a ceramic iron

Spray Ice Spray by Pantene on my brush and brush all of my hair.

Last step : use the cool shot on my blow dryer to set the style in.

Hope this helps =]

you need to get a better hair straighner