Oral-B’s best for whitening clean (excluding Oral-B iO), Whiter teeth starting as of day 1 by removing surface stains, With Clean Maximizer technology, green bristles turn yellow when it is time to replace your brush head, With exclusive polishing cup, Dentists recommend to change brush head every 3 months for the best clean, Compatible with all Oral-B handles except Pulsonic & iO, Number of toothbrush heads included in this pack: 8, Choose Oral-B, #1 used by dentists worldwide. Dentists recommend replacing your toothbrush head about every 3-4 months, or when bristles are faded and worn. Oral-B offers a variety of toothbrush heads to fit your personal oral health needs.