PS:Suitable for SOOCAS X1/X3/X3U/X5 Features: 1. Soft DuPont bristles, well suited for touchy teeth to use 2. Ultrasonic electric toothbrush can effectively get rid of plaque and reduce gingival necrosis. 3. Adopt DuPont American tynex standard zero bristles bristles,gently in your teeth. 4 bristle tip diameter, deep clean the distance between enamel 5 authorised through FDA and UV sterilized. 6 sealed packing, far more safe to use. 7 replace the toothbrush heads each 3 months 8 you've any questions about the toothbrush model, you might seek the recommendation of guest service. Thank you. Indenpently sealed packing