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

https://www.generate-bookmark.win/ultherapy-targets-the-deeper-4-5-mm-smas-layer-using-ultrasound-waves-lifting

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a deeper lift, with results peaking around 3 to 6 months. In comparison, RF heats tissues to 40-45°C, promoting collagen but with a gentler lift