Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer to lift and...

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

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer to lift and tighten over 3 to 6 months. RF heats skin to around 40-45°C for gradual collagen boost but works more superficially