• Replacement heads compatible with Fairywill FW-507/508/515/551/917/959/2011, FW-D1/D3/D7/D8, most Seago series, ATMOKO HP126A, and Dnsly TB-5 • Not compatible with Fairywill FW-E11/FW-P11/FW-P80 or children's toothbrushes • Made with high-quality materials: ABS/TPE and soft nylon bristles • Remove more stains and plaque than manual toothbrushes, improving gum health • Medium-soft bristles with rounded tips for effective cleaning and gum protection • Three-dimensional design with 30% more bristles and W-shaped form to reach difficult areas • It is recommended to replace the head every 3 months to prevent bacteria buildup • The package includes 10 replacement heads, ideal for long-term use • Easy installation and replacement by twisting, no additional tools required