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

https://beckettsexcellentjournal.cloudhinter.com/posts/why-does-my-jawline-look-softer-even-if-my-skin-texture-is-fine

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