A method, a kit and a first composition for treating hair are provided. The method for treating hair comprises applying to the hair a first composition comprising in a cosmetically acceptable carrier, one or more at least bi-functional carboxylic acids, or cosmetically acceptable salts thereof, or mixtures thereof, and applying to the hair a second composition comprising in a cosmetically acceptable carrier, one or more at least bi-functional carboxylic acids, or cosmetically acceptable salts thereof, or mixtures thereof, wherein the first composition has a pH from 7 to 13 and the second composition has a pH from 3 to 7.提供一種用於護理毛髮的方法、套組及第一組成物。用於護理毛髮的方法包含向該毛髮施加包含存在於化妝品可接受之載劑中之一或多種至少雙官能羧酸或其化妝品可接受之鹽或其混合物的第一組成物,及向該毛髮施加包含存在於化妝品可接受之載劑中之一或多種至少雙官能羧酸或其化妝品可接受之鹽或其混合物的第二組成物,其中該第一組成物具有7至13之pH及該第二組成物具有3至7之pH。無
