Abstract: The invention concerns a process for permanently deforming keratinic fibers, in particular hair, which comprises: applying to the keratinic fibers a reducing composition, to reduce keratin disulfide linkages, the keratinic fibers being placed under mechanical tension before, during or after said application, preferably before, then applying to the keratinic fibers an intermediate rinsing composition comprising at least one salt of a monovalent metallic cation and/or at least one ammonium salt, and at least one organic acid, said one or more monovalent salts not being one or more salts of said one or more organic acids present in the intermediate rinsing composition, and said one or more salts not being surfactants, then applying to the keratinic fibers an oxidative composition in an oxidation fixing step, to recreate said linkages, said process being free of any water rinsing step either between the reducing composition application step and the intermediate rinsing composition application step, or between