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

https://trulyexpatlifestyle.com/non-surgical-skin-tightening-in-singapore/

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a precise, deeper lift, with results peaking around 3 to 6 months. In contrast, RF heats skin to 40-45°C to boost collagen at shallower depths for gradual tightening