Oral-B Replacement Brush Heads Pro Precision Clean 5+1. The round brush head ensures a thorough cleaning as it surrounds each tooth individually, allowing better access to the spaces between teeth. Compared to a manual toothbrush, it removes up to 100% more plaque. The X-shaped bristles of the Oral-B replacement brush heads are clinically proven to adapt to the tooth surface and remove plaque from hard-to-reach areas that regular bristles cannot access. This technology is gentle on the gums and provides a pleasant brushing experience as well as healthy gums. To ensure optimal cleaning power, dentists recommend replacing the brush head every 3 months. The green indicator bristles change color from green to yellow over time to signal the ideal time to replace the brush head.