Yes, the slight wave is just enought to ruin the blend for me. I use a curl remover from Sally Beauty Supply made for color treated hair. It,s basicaly a mild perm solution that you comb through and leave on as per the directions and it makes the hair straight, which is what my hair is-straight. The slight body wave that stock units come with is probably fine if you wear your hair short but I keep in 3-4 inches and it is very noticable.