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

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

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a deeper lift, taking about 3 to 6 months to show peak results. Compared to RF that heats skin to 40-45°C mainly for collagen tightening, Ultherapy reaches deeper