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

https://astro-wiki.win/index.php/Is_There_Downtime_After_a_Thread_Lift_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