- Replacement heads designed for Oral B IO electric toothbrushes, compatible with models 2, 3, 4, 5, 6, 7, 8, 9, and 10 - Includes 8 units in black, ideal for maintaining oral hygiene over several months - Rounded and dense bristles allow for deep tooth-by-tooth cleaning and help remove plaque - Provide a comfortable cleaning experience, suitable for daily care, teeth whitening, and protection of sensitive gums - Easy installation: simply remove the old head and attach the new one - It is recommended to replace the head every 3 months for optimal and effective cleaning