Ultherapy uses ultrasound to target the 4.5 mm SMAS layer, making it popular...

https://acornmetric.com/s/RtPsQ6zhIUd5-6LDPmcRS

Ultherapy uses ultrasound to target the 4.5 mm SMAS layer, making it popular for lifting deep tissue without cutting. RF heats skin to around 40-45°C to boost collagen, great for mild tightening