PS:Suitable for SOOCAS X1/X3/X3U/X5 Features: 1. Soft DuPont bristles, compatible for touchy enamel to apply 2. Ultrasonic electric toothbrush can effectively get rid of plaque and decrease gingival necrosis. 3. Adopt DuPont American tynex ordinary zero bristles bristles,gently to your teeth. 4 bristle tip diameter, deep clean the distance between teeth 5 authorized through manner of FDA and UV sterilized. 6 sealed packing, way more safe to use. 7 update the toothbrush heads each three months eight you've got any questions on the toothbrush model, you'll search the advice of customer service. Thank you. Indenpently sealed packing