Oral-B FlossAction XFilaments Electric Toothbrush Replacement Brush Heads Refill (3)The Oral B FlossAction Xfilaments replacement brush heads provide a floss like clean for healthier gums.**does not replace flossing. Designed with unique FlossAction bristles to loosen plaque, the dentist inspired round brush head has specially engineered bristles for a complete clean. Max Clean Bristles indicate it's time to change your brush head. Make sure to always clean the brush head thoroughly after use. Oral Bthe #1 brand used by dentists