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

https://wiki-byte.win/index.php/What_Should_I_Ask_a_Clinic_Before_Booking_Ultherapy_in_Singapore%3F

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a natural lift that builds over 3 to 6 months. Compared to RF’s surface heating at 40 to 45°C, it reaches deeper for firmer results