Ultherapy in Singapore uses focused ultrasound targeting the 4.5 mm SMAS layer...

https://alpha-wiki.win/index.php/Is_There_Downtime_After_a_Thread_Lift_in_Singapore%3F

Ultherapy in Singapore uses focused ultrasound targeting the 4.5 mm SMAS layer to lift and tighten skin gradually, with results peaking around 3 to 6 months