Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, promoting...

https://hectorsmasterinsight.novacrestiq.com/posts/thread-lift-migration-how-common-is-it-and-what-does-it-look-like

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, promoting gradual lifting over 3 to 6 months. Compared to RF, which heats skin at 40 to 45°C mainly for surface tightening, Ultherapy goes deeper for longer-lasting results