Crisscross bristles. More cleaning action in every stroke. Battery included. Replaceable. More cleaning action than the leading manual toothbrush. Features: Rotating PowerHead loosens and whisks away plaque from surfaces, gumline and back teeth; Multi-Angled CrissCross bristles reach deep between teeth to lift out and sweep away plaque; Replaceable Brush Head with One-Touch release & lock button; Battery Powered - 1 Replaceable Duracell AA battery included. The brand that more dentists use themselves.