Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer beneath your...

https://hectorsmasterinsight.novacrestiq.com/posts/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 beneath your skin, reaching deeper than most RF devices, which heat tissue around 40 to 45°C. Compared to standard HIFU, Ultherapy offers precise energy delivery