Microderm crystals are primarily composed of aluminum oxide, corundum and what other component?

Microdermabrasion is a popular cosmetic procedure that uses microderm crystals to exfoliate the skin and remove dead skin cells. The primary components of these microderm crystals are indeed aluminum oxide and corundum, which are both effective for their abrasive properties.

The correct component that complements these materials in microdermabrasion systems is silica. Silica is often included because it adds to the exfoliating properties of the crystals, enhancing their ability to polish and rejuvenate the skin. It helps in providing a smoother application during the procedure and can assist in improving the overall texture and appearance of the skin.

The other options do not serve this specific purpose in microdermabrasion. Calcium, salt, and magnesium do not contribute significantly to the microdermabrasion process or the properties of the crystals used, which is why silica is recognized as the correct answer.