Ideal for cleansing oily skin, large pores or hard to reach areas of the face, such as around the nose. Gentle enough for daily use. Clarisonic brush heads are made from a non-porous, soft elastomeric material, resistant to bacterial attachment. All brush heads are precision-designed to oscillate bi-directionally at a sonic frequency of more than 300 movements per second. All brush heads should be replaced every 3 months.