& ltp> 1, if the doctor is not skilled enough, it is easy to have asymmetry between the left and right faces after injection of face-lifting needle. Generally, this situation is related to different injection doses on both sides, different concentrations on both sides and unequal injection positions. & lt/p & gt； & ltp>2. If the injection dose of face-lifting needle is large, swallowing difficulties may occur, mainly because excessive injection will cause muscle relaxation, muscle atrophy and decreased masseter activity. & lt/p & gt； & ltp>3. Generally, the effect of face-lifting needle can only last about 5 to 6 months. If you want to maintain the effect for a long time, you need to inject regularly, but the more injections, the higher the risk. & lt/p & gt； & ltp style = \ " text-align:center \ " & gt； & ltimg src = \ "/uploadfile/image/20200326/158521538803896.jpg \" title = \ "effect map of face-lifting needle injection in dermatology department of Korea Lin Er Shi \" alt=\" & lt/p & gt； & ltp>& ltstrong & gt How to avoid the harm caused by face-lifting needles? & lt/strong & gt； & lt/p & gt； & ltp> 1. You must choose experienced doctors from regular medical institutions for injection. Be sure to fully communicate your situation with your doctor before injection. If you have any medication or past medical history, you should also tell your doctor in time to avoid unnecessary risks. & lt/p & gt； & ltp>2. Before injecting the face-lifting needle, the doctor will clearly mark the injection site, and then inject at the marked site. The injection time is short, so stay relaxed and don't be too nervous. & lt/p & gt； & ltp>3. Pay attention to the relevant nursing after face-lifting needle injection, avoid massaging the injection site, do not wash your face, do not wear makeup within 6 hours after injection, and do not eat irritating and hard food. & lt/p & gt； & ltp>& ltstrong & gt Recommended reading.