Which cosmetic procedure is used to remove dead skin cells mechanically?

Microdermabrasion is the correct answer because it specifically involves the mechanical exfoliation of the skin. During this procedure, tiny crystals are sprayed onto the skin's surface, which gently abrades the outer layer, effectively removing dead skin cells. This process helps to improve skin texture, promote collagen production, and enhance overall skin appearance.

Chemical peels, on the other hand, utilize chemical solutions to dissolve dead skin cells, rather than removing them mechanically. Facials masks typically serve to hydrate or treat various skin concerns, and they do not focus on the mechanical removal of dead skin. Hydradermabrasion combines elements of microdermabrasion with hydration, but it often includes a liquid component that differentiates it from the purely mechanical action of microdermabrasion. Thus, microdermabrasion stands out as the procedure designed specifically for the mechanical removal of dead skin cells.