Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a deeper...
https://www.protopage.com/samuel-flores05#Bookmarks
Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a deeper lift, with results peaking around 3 to 6 months. Radiofrequency heats skin to 40-45°C to boost collagen, offering gentler tightening but at a shallower depth