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

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

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer for a natural lift that develops over 3 to 6 months. Compared to RF, which heats the skin to 40-45°C mainly for tightening, Ultherapy reaches deeper