PS:Suitable for Oclean X/ X PRO/ Z1/ F1Features:1. Soft DuPont bristles, correct for sensitive enamel to use2. Ultrasonic electrical toothbrush can effectively get rid of plaque and decrease gingival necrosis. Adopt DuPont American tynex basic 0 bristles bristles,gently for your enamel bristle tip diameter, deep clear the distance between teeth5 permitted by way of FDA and UV sterilized sealed packing, way more safe to apply replace the toothbrush heads each 3 months8 you've any questions about the toothbrush model, you would search the recommendation of visitor service. Thank you:20/50/100pcs Toothbrush headBuyers showIndenpently sealed packing