For external uses only. Do not use on areas such as wounds, sores, scratches. If irritation develops, discontinue use. Not intended for use with children under 5 years of age without adult supervision. FILTRX is not intended to filter out asbestos dust, chemical vapors, gases, fumes, spray mist or for use in oxygen deficient atmospheres. Do not use if breathing is impaired. Do not use if have a cold or flu. Each filter is for single use only.