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

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, stimulating collagen deep under the skin for gradual tightening. It’s known for visible improvements over 3 to 6 months