Your skin renews itself about every four weeks; skin takes a little longer to turn over as we age. But you can speed the cell-sloughing process along by practicing regular exfoliation. Exfoliation removes the old, dead skin cells from the outermost layer of your skin, giving it a softer texture and more youthful appearance. Skin-care products that contain exfoliating ingredients gently scrub off the build-up of dead cells -- that's true for your face, underarms, or any part of your body.
There can be too much of a good thing when it comes to exfoliation, though, leading to cause skin irritation, dryness and inflammation. Always use a mild exfoliant or soft cloth, and exfoliate gently before shaving. Do this no more than twice a week (less if you have sensitive, pigmented or acne-prone skin or if you use other hair-removal methods).