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

https://www.bookmarkzoo.win/ultherapy-uses-focused-ultrasound-to-target-the-4-5-mm-smas-layer-reaching

Ultherapy uses focused ultrasound to target the 4.5mm SMAS layer, stimulating collagen for gradual tightening over 3 to 6 months. Compared to RF, which heats skin to 40-45°C for surface collagen boost, Ultherapy dives deeper