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Replacement Brush head Replacing your brush head every 6 months is clinically proven to remove more plaque. Use only Sonicare Advance replacement brush heads. Environment HANDLE CONTAINS NICKEL CADMIUM BATTERIES. BATTERIES MUST BE RECYCLED OR DISPOSED OF PROPERLY. The batteries inside your Sonicare cannot be replaced, but are easily removed for recycling. At the end of product life and prior to disposal, please remove the batteries from the handle by following the instructions below. . To help p