The principle of ultrasound facelifting is based on High Intensity Focused Ultrasound (HIFU), which focuses energy at different depths of the skin to create thermal coagulation points at 65-70 degrees Celsius. There are various probes for ultrasound facelifting machines, with the most common firing mode being point-to-line. Therefore, ultrasound facelifting treatments are usually calculated in terms of “lines” or “shots.” Other probes include linear probes and single-point firing probes. Due to the focused nature of ultrasound facelifting devices, there is no thermal damage to the epidermis, making it a non-invasive treatment with virtually no downtime