End-rounded US DuPont nylon bristle are gentle on gums and clean thoroughly teeth surface with comfortable brushing experience. The bristles are medium,not extra soft. Replacement toothbrush heads 5 pack can be used long time. Our toothbrush replacement heads compatible with Fairywill FW-507/508/551/917/959, FW-D1/FW-D3/FW-D7/FW-D8, YUNCHI Y1 electric toothbrushes. They are NOT Compatible with Fairywill FW-E11/FW-P11/FW-P80, and NOT for kids toothbrush.

If you have any questions, please don't hesitate to ask. Replace your brush head every three months as recommended by the American Dental Association. The sonic toothbrush heads made with soft DuPont nylon bristle, trendy "W" tooth-shape, and end-rounded bristle to be safe and gentle on teeth and gums. Gently removes 100% more stain and plaque than manual toothbrushes to improve gum health. Our toothbrush replacement heads compatible with Fairywill FW-507/508/551/917/959, FW-D1/FW-D3/FW-D7/FW-D8, YUNCHI Y1 electric toothbrushes. They are NOT compatible with Fairywill FW-E11/FW-P11/FW-P80, and NOT for kids toothbrush.

GTIN: 738944820636. Best Sellers Rank: See Top 100 in Health & Household. Age Range (Description): Kid. Material: Nylon. Size: 5 Count. Color: Black. Brand: Smarterrcare. : B07Q2M7T6N. Manufacturer: YUNCHI. UPC: 738944820636. Item model number: YCY1TH. Package Dimensions: 4.17 x 4.17 x 0.79 inches; 1.41 Ounces.