The main purpose of a rotary brush is _________.

• A. Massaging
• B. Deep cleansing
• C. Light exfoliation
• D. Disinfection

Answer: (C)

The rotating action of a brush is designed to perform a gentle, mechanical exfoliation. The bristles loosen and remove the outermost dead skin cells on the surface, smoothing texture and helping subsequent products penetrate more effectively. It’s intended to be a mild action, not a deep, aggressive cleansing or disinfection process. Deep cleansing would imply reaching deeper into pores or oil glands, which isn’t the primary function of this tool, and disinfection isn’t achieved by brushing alone. So the best fit is light exfoliation, often used in combination with a cleanser to lift away dull skin cells while keeping the skin’s surface intact.