Ultrasonic electric toothbrush can effectively remove plaque and reduce gingival necrosis. The appearance of the 3D brush adapts to the of the teeth. The small and delicate brush head is easy to touch inside your mouth. This type is suitable for people who smoke or drink coffee. Suitable for X/ X PRO/ Z1/ F1/ One/ Air 2 /SE Electric toothbrushes. Deep cleaning for fitting teeth 3D curved brush head design Featuring a 3D curved design of a toe, it is easy to penetrate into the spaces between teeth and the edges of the gums, Can better fit teeth from multiple angles for balanced cleaning Colour:D:Black Material:ABS+nylon bristles Package Contents: 10 * toothbrush replacement 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.