Ultherapy uses focused ultrasound at a 4.5 mm depth to target the SMAS layer,...

https://www.bookmark-friend.win/ultherapy-uses-focused-ultrasound-to-target-the-4-5-mm-smas-layer-unlike-rf

Ultherapy uses focused ultrasound at a 4.5 mm depth to target the SMAS layer, promoting gradual skin tightening with peak results around 3 to 6 months