Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a natural...
https://www.protopage.com/samuel-flores05#Bookmarks
Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a natural lift that builds over 3 to 6 months. Compared to RF’s surface heating at 40 to 45°C, it reaches deeper for firmer results