HIGHETEST QUALITY AND SAFETY STANDARDS – The kids replacement heads are made with end-rounded US Dupont Tynex Nylon soft bristles for offer exceptional cleaning of Tooth surface and deep between the teeth. | HIGH COMPATIBILITY – The brush heads (standard size) for kids compatible with Phillips Sonicare Kids toothbrush heads electric handles, DiamondClean, FlexCare, FlexCare+, FlexCare Platinum, EasyClean, HealthyWhite, 3 Series Gum Health, HydroClean, 2 Series Plaque Control, PowerUp and All Snap-On toothbrush handles. | INTIMATE DESIGN FOR KIDS –Standard kids toothbrush heads designed for children's oral cavity size, curve bristles fit children's teeth, the toothbrush head with non-toxic (BPA-Free) natural rubber wrapped on the back to prevent the brush head and gums violent collision, better protection, care your kids young teeth. | METAL RING DESIGN- Premium 304 Stainless Steel can balance the kid brush head vibration and reduce noise.With 31000 strokes per minute operation to achieve deep cleaning. Dentists Recommend Replace The Brush Head at Least Once Every 3 Months. | SERVICE GUARANTEE– Senyum replacement brush heads for kids with a hygienic storage and travel hat, protects your toothbrush heads, 100% satisfaction guaranteed or your Refund.