Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a deeper...

https://beausexpertchat.quantlynix.com/posts/ultherapy-vs-standard-hifu-what-did-the-2024-study-say

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a deeper lift, with results peaking around 3 to 6 months. RF heats skin to about 40 to 45°C, stimulating collagen more superficially