Everyone naturally ages, and wrinkles and sagging skin will appear at a certain age, so countless beauty lovers have gone forward and backward, giving rise to countless medical beauty programs. The first laser, pulsed light and radio frequency electric field, but limited by the depth of action, often only tighten the skin, the effect is not ideal; then there is ultrasound technology, its depth of action is deeper, the effect is also more obvious, claiming that painless, non-invasive will allow you to return to the peak of the face, and in this series of ultrasound project, the highly respected is the ultrasonic knife. It is true that ultrasonic knife is a non-invasive and less painful project, but don’t look at it without an incision and think that it is 100%, in fact, its danger is also obvious. Not for anything else, but for the depth of its action. From the anatomical level of traditional face lift surgery, it is clear that in order to achieve a more pronounced and long-lasting tightening effect, ultrasonic knife focused ultrasound treatment depth is close to the superficial muscle tendon system (SMAS) layer, and focus on the lower middle part of the treatment, so it may cause damage to the adjacent superficial nerves. If you compare the entire skin of the face to a house, the depth of action of the ultrasonic knife is almost at the foundation of the house, so it is easy to understand where the danger lies! Patients who suffer from nerve damage due to ultrasonic knife treatment will generally have limited expression movement after surgery, such as crooked corners of the mouth. This is mainly because the ultrasound energy is focused to the superficial facial nerves, causing nerve fiber damage. If the focus hits the focal point at a higher intensity, it may also cause a permanent trauma, i.e. facial paralysis. But not everyone will experience nerve damage, so why is this? First of all, if the ultrasonic knife equipment is genuine, i.e. the American version, plus the operator is very professional, then the risk is not really significant. Conversely, if the medical facility or equipment is not legitimate, or if the doctor does not operate properly, then it is a matter of pure probability whether something will go wrong. And it should be noted that the ultrasonic knife in the United States as a medical device management, but in China has not been incorporated into medical devices and not access to its imports, that is, the ultrasonic knife in China did not obtain the State Drug Administration NMPA certification. This means that there is currently no medical institution in China that can do this treatment, but the fact is that countless people do, and the reputation is polarized. The reason for this lies in the fact that pirated machines may have been encountered. How can we avoid such extreme cases of nerve damage? The first thing is to look at the qualifications of the medical institution and check if their machine is genuine. If you want to completely avoid encountering a pirated version, you can consider doing it abroad, but now that the epidemic is under control, it is not recommended to leave the country. The second thing is to look at the qualification of the doctor, if the doctor has a lot of experience in operating, to a large extent, you can avoid this situation. And be careful to avoid some areas where the nerves are relatively shallow, such as parts of the frontal area, intraorbital, at the zygomatic arch and around the mouth. The last thing is to consider whether the individual is physically fit for ultrasonic knife treatment, which requires an interview with a professional doctor. If unfortunately nerve damage has been caused, prompt medical attention is recommended. In the relevant treatment cases, the vast majority of patients recovered after systematic medication. However, due to the limited number of cases observed, it is still necessary to be alert to the risk of irreversible damage that it may cause. We all know that invasive treatments have risks, but the risks of non-invasive treatments should not be ignored anymore! As always, medical aesthetics has risks, so choose carefully! References [1] Bai Yuqing, Yu Yang, Yao Mei, Han Yufen, Xu Xiao Ke. Prevention and treatment of facial nerve injury by ultrasonic skin tightening [J]. Chinese Journal of Medical Aesthetics and Beauty,2017,23(05):346-347.