Wisdom Powertek Replacement heads are high quality fit and performance for great power cleaning with compatible handles. The oscillating head provides powerful plaque removal for effective cleaning and a healthier mouth. Compatible with most Oral-B toothbrushes. Ensure head is compatible with handle (see details below), ensure toothbrush handle is free of any toothpaste residue, to fit the brush head to a compatible handle slide head onto shaft and push gently until engaged, rinse brush head thoroughly after each use. Adult supervision required for children under 6. This product is not to be used by persons (including children) with reduced physical, sensory or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning the product by a person responsible for their safety. DOES NOT FIT: Pulsonic, Oral-B Sonic Complete, Oral-B Vitality Sonic, Oral-B Complete battery toothbrush, 3D White battery toothbrush and Oral-B Cross...