Gently Brightens and Tightens Skin, Fades Dark Spots, Reduces Fine Lines. Microdermabrasion uses medical grade sodium bicarbonate crystals (not aluminum oxide crystals) to gently exfoliate even the most sensitive skin, revealing smoother and healthier skin. It makes dull skin glow, fades dark spots, and minimizes fine lines. It also stimulates the production of collagen, tightening your skin. There is no irritation or down-time after treatment.