HIFU  with similar principle as concave lens.
Focus the sound wave to an point to cause high temperature.
It is used to oncotherapy treatment in early date. Now it use to beauty field.
Acoustic focuse on a point under subcutaneous tissue.
3mm: collagen layer and 4.5mm: fascia layer ( SMAS )
Once temperature exceed 65 degree centigrade, the focused SMAS Produce the protein coagulation
responses and cause tensile force around this circle. Promote collagen rebuilding.
New collagen will keep facial lifting and whitening, also remove wrinkle.