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

https://www.booknose.win/ultherapy-targets-the-deep-4-5-mm-smas-layer-using-ultrasound-encouraging

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