Installation and removal of classic or semi-permanent nail polish, false nail application with gels or resins, nail art decoration are all activities that expose workers, mostly women, to products containing dangerous chemicals. Some of the substances contained in the resins, glues, solvents and varnishes used by nail technicians can lead to the occurrence of cutaneous and / or respiratory allergic reactions, which are responsible for 75% of the professional pathologies diagnosed in this sector. The most common ones are allergic contact dermatitis, which causes an inflammation of the skin that can lead toworkers having to stop working in the sector. In addition repetitive gestures, prolonged, constrained sitting work postures, vibrations of tools, etc. can also promote the occurrence of musculoskeletal disorders (MSDs). To help professionals in this sector to identify and assess different risks, a this new OiRA tool has been developed by INRS in collaboration with stakeholders from the sector.