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Ear wax guard is designed to keep ear wax, dust, grease and moisture away from blocking the hearing aids. It needs to be replaced from every week to every month, depends on the ear canal condition. Different people have different ear canal conditions. The filter should be replaced BEFORE it is full of ear wax or dust. Or the speaker of the hearing aid will probably be blocked. Package:2 pack per Oticon Wax Guard Notice: If a medical condition exists, such as a perforated eardrum, or if an ointment is used, do not use the wax guard. COMPLETE SATISFACTION: If you are unsure of fit, please utilize the "Ask a Question" function. Please refer to 'Product Description' for further information on sizing and compatibility. 100% CUSTOMER SATISFACTION:We're always willing to listen to your concerns! So please free feel to contact us.