For preventing and/or treating scalp disorders, at least one probiotic microorganism in particular of the Lactobacillusand/or Bifidobacterium speciesgenus, of its fraction and/or metabolite, as cosmetic agent is used. Independent claims are included for following: 1) a cosmetic and/or dermatological composition for preventing scalp disorders comprising effective amount of probiotic microorganism, in particular of the Lactobacillusand/or Bifidobacterium speciesgenus, in combination with an effective amount of at least one active agent selected from antidandruff active agent and/or hydrating active agent； 2) cosmetic process for preventing and/or treating dandruff condition of scalp involving administering a first cosmetic active agent over a first and second consecutive periods of time, where the periods of time together forming a sequence, and at least second cosmetic active agent, topically over a single period of time selected from the first and second periods of time, where the first and second cosmetic active agents being formulated in separate compositions, the first cosmetic active agent being selected from probiotic microorganisms, and the second cosmetic active agent being selected from antidandruff active agents； and 3) cosmetic assembly comprising at least first and a second cosmetic composition, where the first composition containing at least an effective amount of at least first cosmetic active agent, the first cosmetic active agent being Lactobacillus paracasei, and the second composition containing a second cosmetic active agent selected from antidandruff active agents and being administered topically. ACTIVITY : Dermatological； Antipruritic； Antiseborrheic. Test details described, but no results given. MECHANISM OF ACTION : None given.
