SONIC BRUSH: Dermatologist-developed. Sonic movement offers deep yet gentle cleansing. Two bristle types for targeted cleansing in hard-to-reach, contoured areas of the face where dirt hides. Waterproof. Swiss engineered. For all skin types. Use once daily for 30 seconds. Build up to 1 minute, twice daily. Apply cleanser to moistened skin or brush head. Massage in circular motion for 15 seconds on cheeks using white bristles. Massage in up-and-down motion for 15 seconds on T-Zone using green bristles. Rinse and pat dry. Exfoliate and moisturize. Rinse brush head after each use. Great skin just got better. Improve your 3-Step routine with Clinique's dermatologist-developed Sonic System Purifying Cleansing Brush. BRUSH HEAD: Dermatologist-developed Brush was designed with two types of bristles for targeted cleansing. Angled tip tilts deep into T-Zone. Gently but thoroughly cleanses larger areas like cheeks. Draws out impurities for smooth, glowing skin, purified pores. How To Replace Brush Head: 1. Hold Brush head, angled tip facing up. Gently but firmly press the Brush head onto the round disk until you hear a click. 2.Replace Brush head every 3 months for best results.