Specially designed to provide up to 5x better cleaning at the gumline*. Features special cup shape bristle design for cleaner teeth & healthier gums*. *vs. a regular manual toothbrush. The four replacement brush heads in this pack fit all Braun Oral-B electric toothbrushes. They have extra soft, rounded bristles in the center to protect the teeth from too-firm brushing. Long interdental tips on the edges clean deep between teeth and below the gum line and fade after prolonged use, indicating when a brush head needs replacing. The necks of the brush heads have removable color-code rings to identify individual brush heads for family members.