Brush and floss at the same time using the Waterpik Sonic-Fusion Flossing brush heads SFRB-2WB. Featuring a soft, high-low bristle pattern, these patented flossing brush heads gently brush the surface of your teeth while the water flosser in the center of the brush head cleans between teeth and below the gumline. 2 replacement toothbrush heads per package: 1 black with chrome color ring, 1 black with black color ring. For Waterpik Sonic-Fusion flossing toothbrush (SF-01, SF-02) units only. Replace every 3 months.