Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer, stimulating...

https://www.bright-bookmarks.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, stimulating collagen deep under the skin for a natural lift