Ultherapy targets the deep 4.5 mm SMAS layer using ultrasound to lift and...

https://chancesinsightfulinsights.brightsora.com/posts/is-numbness-after-hifu-normal-or-a-red-flag

Ultherapy targets the deep 4.5 mm SMAS layer using ultrasound to lift and tighten over 3 to 6 months, making results feel natural and gradual. RF heats skin to 40-45°C for collagen boost but works closer to the surface