PS:Suitable for SOOCAS X1/X3/X3U/X5 Features: 1. Soft DuPont bristles, compatible for sensitive tooth to apply 2. Ultrasonic electrical toothbrush can effectively get rid of plaque and reduce gingival necrosis. 3. Adopt DuPont American tynex traditional 0 bristles bristles,gently in your teeth. four bristle tip diameter, deep clear the space between enamel 5 accepted by means of FDA and UV sterilized. 6 sealed packing, far more safe to use. 7 replace the toothbrush heads each three months eight you've got any questions about the toothbrush model, you possibly can search the advice of customer service. Thank you. Indenpently sealed packing