The Oral-B Pro CrossAction brush head features more than 2200 perfectly angled bristles that remove up to 100% more bacterial plaque than a manual toothbrush – for cleaner teeth and healthier gums. The original Oral-B brush heads are designed with X-shaped bristles that clean areas that regular bristles cannot reach. The green indicator bristles gradually turn yellow depending on individual usage, indicating the optimal time to replace the brush head – for 100% cleaning power. Guaranteed compatibility with all Oral-B rechargeable toothbrushes, except for Pulsonic and iO.