Exfoliation is defined as “the process of removing dead skin cells from the outer layer of your skin”, according to the American Academy of Dermatology. There are two types of exfoliation: physical and chemical. Physical exfoliation, also referred to as mechanical exfoliation, utilizes an abrasive substance to scrub away dead skin cells through motion. Examples of physical exfoliants include microbeads, pumice crystals, crushed walnut shells, clay, sugar, salt, and jojoba beads. While physical exfoliants are widely used in face scrubs, they are often too abrasive for the skin on the face. Excessive use of physical exfoliants can lead to micro-tears in the skin, redness, dryness, and inflammation. Physical exfoliants are often better suited for very rough areas on the body, such as the heels, knees, and elbows.