The Philips Sonicare HX9054/88 replacement brush heads are specifically designed for the Premium Gum Care line to help you maintain healthier gums. This set includes 4 brush heads, providing a comprehensive supply of accessories for your oral care routine. Each black brush head features soft bristles arranged in an oval, concave layout that contours to your teeth for a more thorough clean. These heads work with Sonicare Fluid Action technology to drive fluid deep between teeth, which allows them to remove up to 10x more plaque than a manual toothbrush and improve gum health in as little as two weeks. The soft-touch rubber head provides a comfortable grip during use, making them a gentle yet effective choice for those focusing on periodontal care. Please note that while they fit most Sonicare handles, they are not compatible with the Philips One series.