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

https://www.bookmark-tango.win/ultherapy-uses-focused-ultrasound-to-target-the-4-5-mm-smas-layer-for-a-natural

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, stimulating collagen deep beneath the skin. Unlike RF that heats surface layers to 40–45°C, Ultherapy works deeper for a gradual lift over 3 to 6 months