Uniquely designed with ultra soft bristles, the Philips Sonicare Sensitive brush head is soft on teeth and gums, yet effective on plaque. The ultra soft bristles combined with a new curved bristle field provide less pressure on teeth and gums. The brush head includes reminder bristles to ensure brush head replacement every 3 months as recommended by the American Dental Association. A fresh brush head every 3 months maximizes the effectiveness of Philips鈥?unique Sonicare technology. Essential Oil Warning: Toothpaste containing essential oils can damage your brush head. Avoid direct contact with products that contain essential oils or coconut oil. Use may result in bristle tufts dislodging. Compatible with snap on Philips handles: DiamondClean, Flexcare, HealthyWhite, 3 Series Gum Health, 2 Series Plaque Control, and Essence+ handles.