Pack contains four brush heads, providing great value and extended use Exclusively designed to fit Oral-B iO electric toothbrushes Each brush head features precision bristles that clean deep between teeth while being gentle on gums Advanced technology enables removal of up to 25% more plaque compared to standard brushing Dual-length bristles, angled at 16 degrees and featuring spiral pattern, deliver a 360-degree deep clean and access hard-to-reach areas for effective plaque removal Signature round brush head, with thousands of bristles, adapts to your unique tooth shape for optimal cleaning performance Smart bristles fade to white, letting you know when it's time to replace your brush head Replace your brush head every three months to ensure consistent cleaning effectiveness and achieve the efficient results