Device for treating human keratinous material including closed-loop cleaning

A device for treating human keratinous material comprising a handpiece comprising:

• a treatment head to be placed in contact with the keratinous material that is to be treated, defining at least one treatment zone,
• at least one reservoir for containing a fluid,
• at least one circuit for the circulation of the fluid used in the treatment, comprising
• at least one canal for conveying the fluid to the treatment zone from the reservoir and at least one canal for returning the fluid from the treatment zone,
• the device further comprising:
• a shut-off part intended to be brought into contact with the treatment head in the absence of use of the device for treating the human keratinous material, this shut-off part having a surface designed to close off the treatment zone in such a way as to allow the fluid to recirculate in the fluid circulation circuit (6) without the treatment head being in contact with the human keratinous material.