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

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

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, stimulating deeper collagen production with results that peak around 3 to 6 months. Unlike RF, which heats skin to 40-45°C for surface tightening, Ultherapy reaches deeper for lifting