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

https://www.protopage.com/samuel-flores05#Bookmarks

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, helping to lift and tighten deeper tissues with results peaking around 3 to 6 months. Compared to RF, which heats skin to 40-45°C for surface collagen boost, Ultherapy works deeper