Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer, promoting...

https://fernandosnicethoughtss.scriblorax.com/posts/what-are-ultherapy-lines-and-why-do-they-matter

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer, promoting gradual tightening over 3 to 6 months. Compared to RF, which heats skin to about 40 to 45°C to boost collagen, Ultherapy reaches deeper layers for lift