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

https://www.fastbookmarks.win/ultherapy-uses-focused-ultrasound-to-target-the-4-5-mm-smas-layer-promoting

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a firm lift, with results peaking around 3 to 6 months