Compact replacement brush heads: Genuine Waterpik replacement toothbrush heads with a smaller, slimmer toothbrush head that provides excellent access for precision cleaning of all tooth surfaces Advanced design: Advanced brush head design with high-low bristle configuration to provide a superior clean that helps remove plaque 3 Count: Included in each package are 3 replacement sonic toothbrush heads, color-coded for multiple users, replace every 3 months Fits only these waterpik models: Complete Care (WP-900), Complete Care 7.0 (WP-950/WP-952), Ortho Care (WP-940), Sensonic Professional Plus Toothbrush (SR-3000) Customer support: Waterpik’s Fort Collins, Colorado support team is available to help with any product questions or needs