Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer for natural...

https://gravewind33.gumroad.com/p/how-many-ultherapy-treatments-have-been-done-worldwide-unpacking-the-global-track-record

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer for natural tightening with results that peak around 3 to 6 months