My hair is pretty straight but has gotten what I call a weird sort of wave to it as I've gotten older. I've had a keratin treatment twice on my hair & I love it! It doesn't make your hair straighter, but it does take out the sort of frizzy kinks that I would get when it was humid or damp out. I can blow dry it and it is completely straight and will stay straight no matter the weather, including wind. I guess the best way to say it is that it has given me more control over how my hair looks. I could definitely tell a difference when it started to wear off. HTH
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