The device including support intended to be placed in a patient's perioral area and has a generating member of a gaseous fluid flow exerting a barrier effect between an inner area of the patient's mouth and the outside of the mouth； where the generating member is formed by at least one duct that includes at one of its ends an aperture which is placed in the exterior of the perioral area in front of said support and is attached to the support in a central portion thereof.
