Cavitation is a relatively new service offered by the aesthetic/cosmetic/beauty industry. It uses ultrasound waves that convert fat cells within the body to liquid, which is then filtered and expelled through the body’s own natural drainage system. Cavitation is a relatively new service offered by the aesthetic/cosmetic/beauty industry. It uses ultrasound waves that convert fat cells within the body to liquid, which is then filtered and expelled through the body’s own natural drainage system.