Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a deeper...
https://gravewind33.gumroad.com/p/how-many-ultherapy-treatments-have-been-done-worldwide-unpacking-the-global-track-record
Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a deeper lift that unfolds over 3 to 6 months. RF heats tissues around 40 to 45°C, stimulating collagen closer to the surface with faster recovery