- Oral-B Pro Cross Action abz-37 replacement heads designed for electric toothbrushes - Includes 8 brush heads with angled and X-shaped bristles for maximum cleaning - Removes up to 100% more plaque compared to manual toothbrushes - Indicator bristles that change color to signal when it's time to replace - Guaranteed compatibility with most Oral-B electric toothbrushes (except Pulsonic and iO) - Easy to install: simply align and attach to the electric toothbrush head - Recommended to replace every 3 months or when the bristles change color - Do not use on children - Maintains oral hygiene and contributes to healthier gums