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

https://www.bookmark-zulu.win/ultherapy-uses-focused-ultrasound-to-target-the-deep-4-5-mm-smas-layer

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