Ultherapy and laser skin rejuvenation each offer unique benefits. In the case of Ultherapy, these benefits result from the introduction of ultrasound waves into the deeper layers of the skin. There, the energy causes existing collagen to strengthen and also invites the production of healthy new collagen, something that the body doesn't do on its own to an ideal extent. Laser treatments can also stimulate collagen remodeling and production but these tend to work by obliterating at least a fraction of the skin's surface. Ultrasound passes through the skin without causing surface wounds.