HIFU is a high intensity focused ultrasound. This treatment is a non-invasive and painless aesthetic medicine technique used to reduce flaccidity in the face and in some parts of the body (arms, abdomen, neck). Its function is as follows: a high-frequency ultrasound is made through an effect called magnifying glass, acts on the deeper layers of the skin without damaging the surfaces at a temperature of 65-75 degrees, the temperature stimulates the production of new collagen and elastin that serves to give firmness to the face.