Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer beneath your...
https://tiny-wiki.win/index.php/Does_RF_Skin_Tightening_Reach_the_SMAS_Layer%3F
Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer beneath your skin, promoting a natural lift over 3 to 6 months