The Oral-B Pro CrossAction Black Toothbrushes feature uniquely angled bristles designed to reach deeper between teeth and along the gumline for superior cleaning. These replacement heads are engineered to remove up to 100% more plaque than a regular manual toothbrush, promoting healthier gums and a brighter smile. The indicator bristles fade halfway to signal when it's time for replacement, ensuring optimal performance with every brush. Ideal for daily use, this 4-pack provides a convenient supply of high-quality brush heads to maintain your daily oral hygiene routine effectively.