Replace the worn brush head with the Oral-B iO series gum and sensitive brush heads. Featuring advanced iO technology with 4, 000+ extra-soft bristles, they deliver effective plaque removal while remaining gentle on your gums. Plus, the optimized bristle patterns adapt to the curves of your teeth and gums, ensuring ultimate comfort—even for sensitive teeth and gums. | Oral-B iO Series Gum & Sensitive Replacement Brush Heads - 4 Pack - White