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