Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for gradual...

https://bizzmarkblog.com/is-ultherapy-fda-cleared-for-lifting-or-just-tightening/

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for gradual skin lifting, with results peaking around 3 to 6 months. Compared to RF which heats surface layers to 40-45°C for collagen stimulation, Ultherapy reaches deeper