The unique Precision Clean bristles brush away plaque for a superior tooth-by-tooth clean than with a regular manual toothbrush. Oral-B’s improved Precision Clean toothbrush heads are developed with CleanMaximiser technology that turns green bristles yellow for optimal brush head performance and the best clean. Compatible with all Oral-B handles except Pulsonic & iO. Packaging may vary.Dentists recommend replacing your toothbrush head about every 3-4 months, or when bristles are faded and worn.Compatible with the entire line up of Oral-B rechargeable electric toothbrush handles, except for Oral-B sonic toothbrushes.The brush heads in this refill pack are compatible with: Oral-B Genius 8000, 9000. Oral-B PRO 600, 650, 1000, 2000, 2500, 3000, 4000, 4900, 5000, 6000, 6500, 7000. All Oral-B Vitality and Vitality Plus Variants. Each order comes with 4x Oral-B Precision Clean Electric Replacement Toothbrush Heads.The unique bristles brush away plaque for a superior tooth-by-tooth clean than with a regular manual toothbrush, Up to 100% more plaque removal and healthier gums vs. a regular manual toothbrush, With CleanMaximiser technology, green bristles turn yellow when it is time to replace your brush head, Compatible with all Oral-B handles except Pulsonic & iO, Compatible with all Oral-B handles except Pulsonic & iO, Number of toothbrush heads included in this pack: 4, Choose Oral-B, #1 used by dentists worldwide