Stérimar Nasal Hygiene (Isotonic) is a medical device and is recommended for children and adults :- For daily nasal hygiene:- Helps children learn how to blow their nose- Restores the moisture of the nose (combats the effects of air conditionning, central heating.)- To assist with ENT disorders.Stérimar, thanks to its fine microdiffusion spray, gently moisturises and cleanses the nasal passages to aid natural healthy breathing.nsert the nozzle into the nostril. Press the nozzle briefly, let any excess solution run out, then blow your nose.Repeat the operation in the other nostril.Clean the nozzle with tepid soapy water, rinse and dry.