Microdermabrasion is a non-invasive procedure that uses tiny crystals or other exfoliating surfaces to help remove the superficial layer of dead skin cells. When you remove the stratum corneum, or the top layer of skin, the body interprets it as an injury. It then quickly replaces the lost skin cells with new, healthy ones. The entire procedure usually takes about 30 minutes for the face. The machines can buff and polish the skin using a stream of fine crystals or a diamond tip, while some also vacuum loose skin cells from the face.