The bristles of the Oral-B Pro Precision Clean brush head remove plaque for better tooth-by-tooth cleaning compared to a regular manual toothbrush. Authentic Oral-B brush heads feature new X-shaped bristles that clean areas inaccessible to rounded bristles. The bristles change from green to yellow, reminding you to replace the brush head to maintain optimal cleaning efficiency. Guaranteed compatibility with all Oral-B rechargeable electric toothbrushes, except for Pulsonic and iO toothbrushes.