Skincare Devices Part 3: Cleansing Brushes

If you have one and only one techy skincare gadget, it’s probably an ultrasonic cleansing brush. In case you missed the boat, these electric brushes use sonic frequency to cleanse the skin more throughly than possible with your bare hands. And that gentle extra exfoliation is paramount: By the time you're 25 years old, your skin's natural rate of exfoli…