Ultherapy targets the deeper 4.5 mm SMAS layer using focused ultrasound, making...

https://charlie-wiki.win/index.php/Why_Do_Some_People_See_No_Change_After_HIFU%3F

Ultherapy targets the deeper 4.5 mm SMAS layer using focused ultrasound, making it ideal for lifting and tightening with natural results developing over 3 to 6 months. RF heats skin to 40-45°C for surface tightening but doesn’t reach the SMAS