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

https://www.bookmarkingqueen.win/ultherapy-uses-focused-ultrasound-targeting-the-4-5-mm-smas-layer-for-deep-skin

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a gradual lift, with results peaking around 3 to 6 months. Radiofrequency heats tissue to 40-45°C for collagen tightening but works more superficially