16 Angled bristles effective plaque removal along the gumline color indicator reminds you to change a round brush head with precisely angled bristles that are built to reach deep between teeth and along the gumline. The densely packed bristles work in multiple directions to loosen and remove plaque, while the rounded tips are gentle on gums. Indicator bristles change color over time, so you can easily see when it's time for a new brush head to maintain optimal cleaning. Advantages crisscross bristles angled at 16 for targeted cleaning between teeth. Round design that surrounds each tooth for thorough, controlled brushing. Indicator bristles cleanmaximiser fade and signal when effectiveness decreases. Gentle, rounded brush tips help protect gums. Designed to take full advantage of oral-b's oscillating-rotating technology. How to use the product click the brush head onto the handle until it clicks. Wet the brush head and apply a small amount of toothpaste. Brush for about 2 minutes with light pressure move the brush head slowly from tooth to tooth and let the round head do the work. Rinse the brush head thoroughly after use and let it air dry. Compatibility and replacement fits most oral-b electric toothbrushes with round brush heads e.G. Pro, smart, genius and vitality . Does not fit io and pulsonic. Replace approximately every 3 months or sooner if indicator bristles have faded to yellow. Result consistent use provides a clean and fresh mouth feel, thorough plaque removal...