a hair care composition containing inorganic fluoride for straightening , smoothing , and / or relaxing hair , and a method for using the hair care composition a hair care composition containing an inorganic fluoride for straightening , smoothing , defrizzing , curling and / or relaxing of hair , and its method of use in a variety of hair care products , e . g ., straightener solution , shampoo , conditioner , color binding treatment , volumizing treatment , a combination thereof , etc . the hair care composition is formaldehyde - free , even when heated .