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

https://bizzmarkblog.com/is-ultherapy-fda-cleared-for-lifting-or-just-tightening/

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