Hello, face-lifting needle can relax and contract facial muscles by blocking nerve impulses of nerves and muscles, so as to achieve the effect of face-lifting. How long it takes to see the effect after injection depends on everyone's facial condition and masseter muscle hypertrophy. Generally, you can see the effect of face-lifting within 1-2 weeks, and the effect of face-lifting reaches the best about 2 months after operation. At this time, the masseter muscle can be reduced by about 30%. However, it should be pointed out that due to the influence of physical factors, some beauty lovers may not be able to show the face-lifting effect of face-lifting needle until 3-4 weeks after operation. This is a normal phenomenon, so don't be too alarmed. As long as you choose a regular medical plastic surgery institution to find a professional doctor for injection, the general effect will be quick.