Ultherapy uses focused ultrasound to target the 4.5mm SMAS layer, promoting...

https://reidscoolthoughtss.swiftnestly.com/posts/what-does-a-proper-assessment-look-like-before-skin-tightening

Ultherapy uses focused ultrasound to target the 4.5mm SMAS layer, promoting gradual skin tightening over 3 to 6 months. Compared to RF, which heats tissue to 40-45°C for collagen boost, Ultherapy penetrates deeper