The last thing oily skin needs is a scrub that’s going to force it to pump out even more grease. This oscillating brush has a gentle way of cleaning without messing with the skin’s natural oils, dermatologists say. Plus, it’s crazy-flexible. "You can use it in the shower, set a timer so you don’t overcleanse, and swap in an assortment of brush heads," says Amy B. Lewis, an N.Y.C. dermatologist.