Toothbrush Head with DuPont Bristles is designed to provide a deeper, more effective clean. Its unique shape increases contact with your teeth and gums, helping to remove up to 99.99% of plaque and stains, making it perfect for everyday use. Compatible with the Operan 989 Electric Toothbrush, it delivers up to 40,000 Vpm for a superior clean that reaches even the toughest spots. Each pack offers a 6-month or 1-year supply, so you don t have to worry about frequent replacements. The brush heads should be replaced every 2-3 months for optimal performance. Installation is quick and easy – just rotate and pull off the old head, then align and press firmly to install the new one. Each replacement head is individually packaged for clean and hygienic storage, making it even more convenient to use. With this brush head, you ll enjoy a hassle-free, fresh, and clean mouth every day.