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

https://www.active-bookmarks.win/ultherapy-targets-the-deep-4-5-mm-smas-layer-using-focused-ultrasound-for

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a gradual lift, with results peaking around 3 to 6 months. RF heats skin to about 40 to 45°C, boosting collagen with less downtime but milder lift