Hair straighteners are attributed to your hair.
(Note: The original sentence seems a bit unclear. If you mean that hair straighteners affect or contribute to the condition of your hair, it might be better expressed as "Hair straighteners have an effect on your hair" or "Hair straighteners contribute to your hair's appearance/condition.")
Hair straighteners can not only make your hair straight but also curl your hair. However, with so many hair straighteners on the market, it's hard to say which one is the best, only what suits you.