Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a deep,...

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

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a deep, natural lift, with results peaking around 3 to 6 months. RF heats skin between 40 to 45°C mainly for collagen tightening but less depth