Ultherapy uses focused ultrasound targeting the deeper 4.5 mm SMAS layer to...

https://www.bookmark-xray.win/ultherapy-uses-focused-ultrasound-targeting-the-4-5-mm-smas-layer-for-gradual

Ultherapy uses focused ultrasound targeting the deeper 4.5 mm SMAS layer to stimulate collagen over 3 to 6 months, offering gradual lifting without downtime