Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for deeper...

https://www.deltabookmarks.win/ultherapy-uses-focused-ultrasound-to-target-the-4-5-mm-smas-layer-helping-lift

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for deeper lifting, with results building up to 3 to 6 months. Compared to RF’s surface-level heating around 40 to 45°C, Ultherapy offers more precise depth