Hifu.As it is based on non-invasive application, it is the latest technology developed to create thermal damage in the targeted area without damaging the skin surface. By using sound waves, the most effective results can be obtained in stretching and tightening thanks to the stimulation of collagen production in the lower layers of the skin. Renewal process after application. It starts immediately. Positive effects are seen even at the first moment, but this effect is temporary. Real results become evident after 30 days. At the end of 90 days, it reaches the maximum level.