Which of the following is an example of mechanical exfoliation?

Mechanical exfoliation involves physically removing dead skin cells from the surface of the skin through friction or abrasion. Granular scrubs, which are made with small particles or granules, serve this purpose effectively. They provide a physical barrier that sloughs off dead skin as they are massaged onto the skin. This type of exfoliation can rejuvenate the skin and enhance its texture.

In contrast, chemical peels use acids or enzymes to dissolve the bonds between dead skin cells and healthy skin, acting on a different principle than mechanical exfoliation. Facial masks may nourish or hydrate the skin but do not fundamentally exfoliate in a mechanical way. Hydrating serums focus on increasing moisture levels in the skin and do not provide any form of exfoliation, mechanical or chemical. Therefore, granular scrubs are distinctly the correct example of mechanical exfoliation, as they rely on physical action to achieve results.