Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer deep under...

https://www.bookmark-jungle.win/ultherapy-uses-focused-ultrasound-targeting-the-4-5-mm-smas-layer-to-lift-and

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer deep under your skin, stimulating collagen over 3 to 6 months for natural lift