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

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

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a deeper lift that unfolds over 3 to 6 months. RF heats tissues around 40 to 45°C, stimulating collagen closer to the surface with faster recovery