Ultherapy uses focused ultrasound at a 4.5 mm depth to target the SMAS layer,...

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

Ultherapy uses focused ultrasound at a 4.5 mm depth to target the SMAS layer, promoting gradual skin tightening with peak results around 3 to 6 months