HIFU works by penetrating the skin with ultrasound energy to stimulate collagen production deep in the dermal and sub-dermal levels. As the tissue heals, it increases collagen. As these collagen fibers organize and shorten, a tightening effect is seen in the skin. The treatment tightens the muscle layer as well as tightens the skin and boosts collagen. These are some of the incredible results: Improves skin tone, lifts brows, jawline, face, and neck, and Reduces double chin and turkey neck, Visit our site at bellareinaspa.com/hifu-skin-tightening for more info.