Q: What is hyaluronic acid? A: Hyaluronic acid, also known as hyaluronic acid, is a substance that exists naturally in the dermis of human skin, and is a natural moisturizing factor of the human body and part of the skin’s scaffolding structure, which plays a role in moisturizing, filling and plumping up the skin. However, since the amount of hyaluronic acid in normal skin is insufficient due to age and climate, injecting hyaluronic acid into the deep dermis can play a good role in wrinkle reduction. Q: What are the indications for hyaluronic acid injection? A: Hyaluronic acid injection can be used for the improvement of interbrow lines, nasolabial folds, and head-lift lines, in addition to depressed scarring or skin defects with larger areas but smaller depths, and also for improving minor collapsed nasal bridges. Q: How does hyaluronic acid feel when injected? Is it painful? A: There is only slight pain at the beginning of the injection. For individual patients who are sensitive to pain, anesthetic can be applied before the injection. Q: Which is more effective, hyaluronic acid or botulinum toxin for wrinkle reduction? A: Hyaluronic acid injection is used to fill static (when the face is not making expressions) wrinkles, while Botox is used to improve dynamic (when the face is making expressions) wrinkles, both of them complement each other. Q: What are the differences between hyaluronic acid and botulinum toxin for people? A: Hyaluronic acid is used for patients with mainly static wrinkles or skin depressions; Botox is used for patients with mainly dynamic wrinkles. Q: How long does hyaluronic acid last? Why is it not permanent? Hyaluronic acid can last for 6~9 months after injection, and the efficacy can be extended appropriately if a supplemental injection is given 4~8 weeks after the injection. Since hyaluronic acid can be completely metabolized by the body and does not accumulate in the body, it is very safe for the human body, so it is a non-permanent injectable material. Q: Is hyaluronic acid harmful to the human body? A: Hyaluronic acid is very safe for human body, non-toxic and non-irritating, and the reaction after injection is mild and does not affect normal life and work. Q: Can hyaluronic acid be used repeatedly for a long time? A: Because it is very safe and does not accumulate in the body, it can be used repeatedly for a long time.