Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer for natural...

https://www.bookmarking-jet.win/ultherapy-uses-focused-ultrasound-to-reach-the-4-5-mm-smas-layer-which

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer for natural tightening with results that peak around 3 to 6 months