Here, we tapped derms to get the scoop on dead skin buildup, including what causes it, signs you have it, and how to safely (!!) remove it. Read on to reveal your glow. King says that living skin cells are found at deeper levels of the epidermis, and those newly birthed cells migrate toward the surface of the skin as others die. In fact, the epidermis uses dead skin cells as a layer of barrier and buffer. So don’t be fooled: These dead cells have a purpose. In a perfect world, this natural shedding process would happen without a hitch, but problems may occur if this process is slowed down, halted, or even sped up. And that, folks, is what we’re discussing below. Unless those cells are properly sloughed away (either naturally or manually, by exfoliation), the skin starts to appear dull, lifeless, and even sometimes flaky and dry. This is where routine exfoliation comes into play. And remember: One option isn’t necessarily better than another. Choose the method that works best for you, your lifestyle, and your skin type: “These are commonly alpha-hydroxy acids (AHAs),” board-certified dermatologist Amy Ross, M.D., says regarding exfoliating the face. “The strength of the acid can be adjusted to create safe, mild, and effective exfoliation for all skin types.” No matter which you choose, each type can help promote cellular turnover to some degree, which results in a brighter, more even complexion every single time. Just know that these are not for everyone (in fact, cleansing brushes are quite controversial in the beauty space, as many believe they can strip the skin and cause dryness). If you absolutely must use a cleansing brush, it’s best to stick to silicone tools since they are far gentler on the skin. Just be sure to use your scalp scrub sparingly (aka, it shouldn’t be part of your daily regimen). Generally, once a week is more than sufficient.