Advanced 2-in-1 Functionality: Each toothbrush head features a combination of medium bristles for effective plaque removal and a tongue cleaner rubber for oral hygiene enhancement, promoting a comprehensive cleaning experience. Superior Whitening Performance: Equipped with densely packed, diamond-shaped bristles designed to target and remove surface stains and plaque for noticeably whiter teeth. Tailored Design for Deep Cleaning: The unique configuration of the bristles focuses on hard-to-reach areas, ensuring a thorough clean that enhances gum health and freshens breath. Universal Compatibility: These replacement heads are compatible with an extensive range of Philips Sonicare click-on models, including the DiamondClean Prestige 9900, DiamondClean Smart, DiamondClean 9000, DiamondClean series, ExpertResults, ExpertClean, FlexCare Platinum, FlexCare+, FlexCare, ProtectiveClean series, as well as the 4000, 3000, 2000, 1000 Series, and Sonicare for Kids. Intelligent Indicator Bristles: Featuring smart indicator bristles, these toothbrush heads visually signal when replacement is needed, typically every three months. The advanced bristle design ensures comprehensive cleaning coverage, reaching every area of the mouth for a consistently thorough clean. Advanced 2-in-1 Functionality: Each toothbrush head features a combination of medium bristles for effective plaque removal and a tongue cleaner rubber for oral hygiene enhancement, promoting a comprehensive cleaning experience.