MySmile DY156 Replacement Heads include 3 high-quality DuPont bristle heads for a 9-month supply. Designed for the DY156 toothbrush, the bristles fade over 2–3 months to remind you when it's time to replace, ensuring effective, professional-level cleaning. | Mysmile | | DY156 Electric Toothbrush Replacement Heads (3 Pack | Blue | Best Buy