How often should you wash your hair?

I've heard it's very unhealthy to wash your hair everyday. I have very thick hair that gets oily fast though, therefore I wash it every other day. Does using a straightner and styling products effect how often you should wash? Do I wash my hair too often? By how often should I wash it, I mean shampoo... show more I've heard it's very unhealthy to wash your hair everyday. I have very thick hair that gets oily fast though, therefore I wash it every other day. Does using a straightner and styling products effect how often you should wash? Do I wash my hair too often? By how often should I wash it, I mean shampoo and conditioner.
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