Hyaluronic acid is a kind of safe material, because hyaluronic acid originally exists in human body, and it will be degraded and absorbed after being injected into human body, so it is relatively safe; Moreover, hyaluronic acid is injected, with little trauma and only pinholes and redness, so there is basically no recovery period and it will not affect normal work and life; Generally, it can be performed without anesthesia, but people who are sensitive to pain can apply topical anesthesia. However, a great disadvantage of this method is that it does not last long. If you want to maintain the effect, you need to inject at intervals, which will naturally cost more.