Well negative ions or not, the heat WILL do some damage (albeit I'm sure a lot less than some cheap Revlon flat iron). Best you can do is use those heat protectant sprays.can anyone knowledgeable about flat irons answer this question: do i risk damaging my hair if i use it daily? i know the stylist kept saying it won't hurt my hair at all because of the negative ions, etc. etc., but come on, i'm sure she was just trying to make a sale...