Combination of regular bristles for cleaner teeth & ultrathin bristles for healthier gums Up to 100 Percent more plaque removal and healthier gums vs. a regular manual toothbrush Oral-B’s best for gentle cleaning and healthier gums (excluding Oral-B iO) Compatible with all Oral-B handles except Pulsonic & iO From the #1 brand recommended by dentists worldwide Number of toothbrush heads included in this pack: 4/8/12