Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer to lift and...

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

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer to lift and tighten deeper tissue, with results peaking around 3 to 6 months. Compared to RF that heats skin to 40-45°C for surface tightening, Ultherapy reaches deeper layers