Sonic skin brushes emit sound waves and vibrate super fast to dislodge dirt, making them useful for treating blackhead- and acne-prone skin, say dermatologists Tina Alster, director of the Washington Institute of Dermatologic Laser Surgery, and Bruce Katz, clinical professor of dermatology at the Mount Sinai School of Medicine. Electric brushes are less expensive but might not offer the same benefit and potentially grind dirt into the skin, creating microscopic cuts, Alster said.

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