The Oral-B iO Ultimate Clean replacement brush heads are engineered to incorporate gentle yet effective micro-vibrations along with a uniquely designed round brush head that mimics dental tools, ensuring a professional standard of cleanliness during your brushing routine. Exclusive to Oral-B iO toothbrush models, these brush heads are effective in removing up to 100% more plaque than a standard manual toothbrush, giving your teeth a noticeably cleaner and brighter appearance. Featuring precision bristles set at a 16-degree angle, they easily access hard-to-reach areas within your mouth. Dentists advise that it's best to change your brush head every three months for optimal dental care, and the bristles on the Ultimate Clean heads diminish in color to signal when it's time for a replacement. Enjoy exceptional cleaning performance with these replacement brush heads, tailored for an ideal fit with your Oral-B iO electric toothbrush.