Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer deep under...

https://devinmqjy235.iamarrows.com/how-do-doctors-decide-ultherapy-energy-level-and-depth

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer deep under the skin, encouraging natural lift over 3 to 6 months. Compared to RF, which heats tissue to 40-45°C mostly near the surface, Ultherapy reaches deeper for firmer support