Ultherapy uses ultrasound to target the 4.5 mm SMAS layer, stimulating collagen...

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

Ultherapy uses ultrasound to target the 4.5 mm SMAS layer, stimulating collagen deep under the skin. It’s known for precise depth control and visible results that develop over 3 to 6 months