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

https://www.booknose.win/ultherapy-uses-focused-ultrasound-targeting-the-4-5-mm-smas-layer-for-natural-1

Ultherapy uses focused ultrasound targeting the 4.5mm SMAS layer, stimulating collagen deep within for lifting that peaks around 3 to 6 months