Product Information Outstanding gum care: The HOUSRUSE standard replacement toothbrush attachment is designed for developed for those who value effective tartar removal in their daily lives and have been shown to reduce gingivitis by up to 100% compared to manual toothbrushes. Matching brush head: HOUSRUSE electric brush head is compatible with Philips electric toothbrush, suitable for HX3/HX6/HX8/HX9/R models. Thicker bristles and rounded ends: Advanced bristle planting technology increases the number of bristles by 40 percent, and the bristles never fall off. All bristle tips of the HOUSRUSE brush head are rounded to avoid scratching tooth surface or damaging gums. Durable and comfortable: HOUSRUSE replacement electric toothbrush heads are made from genuine, high-quality Dupont filament (like branded products) that last longer and provide a gentle cleaning experience that you'll be more comfortable with than ever. When to replace: The built-in brush head reminder lets you know when to replace your brush head so you don't have to worry about it. Dentists recommend replacing your brush heads every 3 months or more.