The 4D HIFU machine delivers high-intensity ultrasound energy deep into the facial tissues and the SMAS layer (muscles), which is the same layer tightened during a conventional surgical facelift. It is within these deep and subdermal layers where the focused ultrasound energy results in microtrauma resulting in a natural body response. As the tissue heals over the 6 – 12 weeks it contracts, tightens and stimulates new collagen production. Collagen is what keeps your skin youthful. It’s the substructure upon which the skin relies on, but as we age the collagen production naturally slows, resulting in the appearance of wrinkles, jowls, eye bags and less elasticity in the skin – all the typical signs of aging.