HIFU uses focused ultrasound energy to reach deeper support layers beneath the skin, including the areas where collagen plays an important role in firmness and facial support. The energy creates controlled heating at precise depths without damaging the skin surface. This gentle thermal effect encourages the body’s natural repair response and stimulates new collagen production. Over the following weeks and months, the treated areas gradually feel firmer and appear more lifted, especially around the cheeks, jawline, and neck. Some people might even see visible lifting immediately after one session due to the heat-induced contraction of the SMAS layer (the layer that gets tightened during surgical facelifts), however, this result varies from person to person.