Experience the Oral-B Sensi UltraThin toothbrush head designed by the #1 dentist recommended brand worldwide – Oral-B. The round petal shape is designed with dentists. It has soft, ultrathin bristles that are gentle on gums, combined with regular bristles that are tough on plaque. Sensi Ultrathin removes up to 100% more plaque and reduces gum inflammation by 100% compared to a manual toothbrush. The unique combination of end rounded and ultrathin bristles make Sensi Ultrathin ideal for everyone with a sensitive mouth and everyone who is looking for just a great gentle clean. Compatible with Oral-B Genius 8000, 9000. Compatible with Oral-B Smart 4000, 4900, 5000, 6000, 6500, 7000. Compatible with Oral-B PRO 600, 650, 1000, 2000, 2500, 3000. Compatible with all Oral-B Vitality and Vitality Plus Variants. Each order comes with 4 x Oral-B Sensitive Ultrathin Electric Replacement Toothbrush Heads.