Abstract: A refill for a device for treating hair, including: a reservoir of elongate shape along a longitudinal axis, defining a cavity containing a cosmetic composition to be applied to the hair, the reservoir having a flank for mounting the refill on the device, extending parallel to the longitudinal axis of the reservoir, a porous application member for applying the cosmetic composition to the hair, of elongate shape and extending parallel to the longitudinal axis of the reservoir. The application member being fitted in a slot-shaped opening in the reservoir that leads into the cavity, this opening being offset laterally toward the mounting flank, relative to a median plane of the cavity that contains the longitudinal axis of the reservoir and is parallel to the mounting flank.

Abstract: A method for treating the hair with the aid of a treatment device, notably a heat treatment device, in particular a straightening device, in which a lock of hair is exposed, while the device is being moved along the latter, in a single operation to: apply cosmetic composition with the aid of an application member of the device, and then to apply steam with the aid of a steam outlet of the device that is offset relative to the application member in the direction of movement of the lock of hair by a nonzero distance v, measured between the median plane of the steam outlet and the median plane of the application member, of less than or equal to 10 mm.

Abstract: An assembly for packaging and dispensing of fluid cosmetic products includes, a threaded axial rod cooperating with a first piston and a second piston that are able to be moved in axial translation inside a tubular container in opposite directions under the effect of a rotation of said rod, the rod being a hollow rod forming at least part of an axial conduit between a bottom of the container and an outlet orifice for the products, the axial rod cooperating in rotation with said dispensing head in such a way that a relative manual rotation of said application head with respect to the container drives a movement of said first piston toward the bottom of the container.

Abstract: The present application relates to an assembly (1) for packaging and dispensing of fluid cosmetic products, a threaded axial rod (60) cooperating with a first piston (81) and a second piston (82) that are able to be moved in axial translation inside a tubular container (2) in opposite directions under the effect of a rotation of said rod (60), said rod being a hollow rod forming at least part of an axial conduit between a bottom (4) of the container and an outlet orifice (52) for the products, said axial rod (60) cooperating in rotation with said dispensing head (50) in such a way that a relative manual rotation of said application head with respect to the container drives a movement of said first piston (81) toward the bottom (4) of the container.