Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer to lift and...

https://mylesxbqi254.trexgame.net/are-thread-lifts-more-predictable-than-energy-based-devices

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer to lift and tighten deep tissues, with results peaking around 3 to 6 months. RF heats skin to 40-45°C to stimulate collagen closer to the surface, ideal for mild tightening