Cleans hard-to-reach places Rotating Powerhead: Loosens and whisks away plaque from surfaces, gumline and back teeth CrissCross Bristles: Reach deep between teeth to lift out and sweep away plaque Delivers more cleaning action than the leading manual toothbrush Replaceable Brush Head Anti-Microbial Bristle Shield helps keep bristles cleaner between brushing. The bristles do not kill bacteria in the mouth or protect against disease. Always clean the product thoroughly after each use. Oral-B Complete Action Replacement Heads with Anti-Microbial bristle protection inhibits microbial growth that may affect the bristles for up to 90 days.