Waterpik Nano Sonic Replacement Brush Heads are designed specifically for Waterpik Nano Sonic toothbrushes. These replacement heads feature dual-colored bristles and an ergonomic design to ensure effective cleaning and optimal oral hygiene maintenance. Key features: • Compatible with Waterpik Nano Sonic toothbrushes • Dual-colored bristle design • Ergonomic brush head shape • Comes in a pack of two brush heads • White handle with turquoise and blue bristles Regular replacement of toothbrush heads is recommended every 3-4 months or sooner if bristles appear frayed. These replacement heads help maintain the optimal performance of your Waterpik Nano Sonic toothbrush for effective daily oral care.