Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer deep under...
https://tiny-wiki.win/index.php/Ultherapy_vs_Standard_HIFU:_What_Did_the_2024_Study_Say%3F
Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer deep under your skin, stimulating collagen over 3 to 6 months for natural lift