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

https://mega-wiki.win/index.php/Ultherapy_vs_Thread_Lift:_Which_Is_Better_for_a_Sharper_Jawline%3F

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a deeper lift, with results peaking around 3 to 6 months. Radiofrequency heats skin to 40-45°C to boost collagen, offering gentler tightening but at a shallower depth