Velvet-like bristle tips are uniquely textured to provide an ultra-gentle cleansing action on sensitive, compromised skin. Extra-plush bristle gradation delivers concentrated flushing of the pores and is safe for use on acne-prone skin. All CLARISONIC® brush heads are made from a nonporous, soft elastomeric material, resistant to bacterial attachment. All brush heads are precision-designed to oscillate bi-directionally at a sonic frequency. It is recommended that you remove the brush head weekly and clean with soap and warm water. Replace your CLARISONIC® brush head every 90 days. How to use: To mount the brush head, align the three notches with the three pins on the handle, then push down and twist clockwise. For best results, replace brush head every three months. By CLARISONIC®.