A method of treating hair in which a first hair treatment composition is applied to the hair, for example a hair root, and a second hair treatment composition is applied to the hair, for example the length and the tip of the hair, wherein the second Wherein the pH of the hair treatment composition is higher than the pH of the first hair treatment composition.第1の毛髪処理組成物が毛髪、例えば、毛根に塗布され、第2の毛髪処理組成物が毛髪、例えば、毛髪の長さ部分及び先端に塗布される毛髪処理方法であって、第2の毛髪処理組成物のpHが第1の毛髪処理組成物のpHよりも高い、方法。