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

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

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, a key support structure in your face, gradually lifting and tightening over 3 to 6 months