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

https://tiny-wiki.win/index.php/Ultherapy_vs_Standard_HIFU:_What_Did_the_2024_Study_Say%3F

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for natural lift and tightening, with results peaking around 3 to 6 months. Radiofrequency heats skin to 40-45°C for collagen boost but works more superficially