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

https://extra-wiki.win/index.php/Is_Ultherapy_Really_Different_from_HIFU_in_Singapore%3F

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