Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer for a natural...

https://www.nav-bookmarks.win/ultherapy-targets-the-deeper-4-5-mm-smas-layer-using-ultrasound-to-lift-and

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer for a natural lift that develops over 3 to 6 months. Compared to RF, which heats the skin to 40-45°C mainly for tightening, Ultherapy reaches deeper