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

https://www.bookmarking-planet.win/ultherapy-uses-focused-ultrasound-targeting-the-4-5mm-smas-layer-promoting

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, stimulating collagen deep under the skin with results peaking around 3 to 6 months