What is the primary purpose of using a vacuum in microdermabrasion?

The primary purpose of using a vacuum in microdermabrasion is to enhance the effectiveness of the treatment by removing the microcrystals and dead skin cells that have been exfoliated from the skin's surface. During the microdermabrasion process, microcrystals are sprayed onto the skin to buff away the outer layer of dead cells, leading to a smoother and more refreshed complexion. The vacuum works simultaneously to suction away these loosened debris, ensuring a thorough exfoliation and preventing the skin from becoming congested with the waste products that result from the procedure. This action not only helps in revealing healthier skin underneath but also aids in stimulating blood circulation and promoting collagen production, which are key benefits of microdermabrasion.

In this context, other options are less relevant to the main function of the vacuum in this treatment.