Oral B Power Toothbrush iO Ultimate Clean Refill White 4 PackThe Oral B iO Series combines powerful, but gentle micro vibrations with Oral B's unique dentist inspired round brush head design for a professional clean feeling every day Size: 4 Pack KEY FEATURES Combines Oral B's unique round brush head with gentle micro vibrations for a surprisingly enjoyable experience and healthy teeth and gums for life Reduces plaque build up along the gumline The dual length bristles surround and reach deep in between teeth