Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer deep under...

https://research-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 deep under the skin, promoting gradual lifting and tightening with results peaking around 3 to 6 months