Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer for a deep...

https://meet-wiki.win/index.php/What_Are_Ultherapy_%27Lines%27_and_Why_Do_They_Matter%3F

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer for a deep lift, with results peaking around 3 to 6 months. RF heats skin to 40-45°C for collagen boost but doesn’t reach as deep. Standard HIFU is quicker but less precise than Ultherapy