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

https://www.fastbookmarks.win/ultherapy-uses-focused-ultrasound-to-target-the-4-5-mm-smas-layer-promoting

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 and tightening