[3D Bristle Cutting Process]The innovative 3D cutting process allows each tooth to be cleaned in three dimensions. The bristles are waved to match the shape of teeth for thorough cleaning of gums and hard-to-reach areas. [Long-lasting Quality]: High-quality plastic and bristles long-lasting durability. 0.152mm round head FOR /PEDEX bristles gently clean teeth without damaging enamel and gums. [Unique W-Shaped Brush Head Design]: Fits teeth perfectly, removes stains and plaque without irritating gums. The ""W"" shaped bristles cleaning in every corner of the teeth. [Easy to Use]: Turn right to open, easy to replace without any additional auxiliary tools. 10 replacement brush heads for long-term use. Dentists recommend replacing your brush heads every 3 months. for FW-507/508/551/917/959, FW-D1/FW-D3/FW-D7/FW-D8 Material: plastic + fiber colour: B-white Package Contents: 10 x replacement toothbrush head Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.