Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, making it...

https://www.easybookmarkings.win/ultherapy-uses-focused-ultrasound-targeting-the-4-5-mm-smas-layer-for-a-firm

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, making it stand out for deeper tightening compared to radiofrequency’s surface-level heating of around 40 to 45°C. Standard HIFU often works at a shallower depth