Ultherapy targets the deep 4.5 mm SMAS layer using focused ultrasound for...

https://donovansultimatewords.nexorafield.com/posts/is-ultherapy-safe-around-nerves-and-bone-because-of-imaging

Ultherapy targets the deep 4.5 mm SMAS layer using focused ultrasound for gradual lifting over 3 to 6 months. RF heats skin to 40-45°C, boosting collagen closer to the surface with quicker results but less depth