Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer, unlike RF...

https://www.bookmark-tango.win/ultherapy-uses-focused-ultrasound-targeting-the-4-5-mm-smas-layer-to-encourage

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer, unlike RF which heats skin to 40-45°C for collagen boost. Standard HIFU often treats shallower layers. Thread lifts offer immediate lift but may carry more downtime