Not long lasting work need make this last longer..
I would recommend this to a friend!
Response from waterpik.comBy WaterPik, Product Support, September 14, 2022
Hello Don - We are sorry for any difficulty you experienced with the SFRB-2EW flossing brush head. We recommend replacing the brush heads every three months. The bristles can splay, making the tip less effective. The tip can also become clogged and/or affected by mineral deposits which lower the lifespan of your unit. Please contact us at 1-800-525-2774 or email smreviews@waterpik.com. Thank you.