The lips are too thin, which affects the appearance. Guangxi General Hospital of Armed Police said that collagen lip augmentation is the most natural lip filler, but it belongs to tissue substitute, so it can't be injected too much, otherwise it will have adverse reactions and even lead to infection. Most importantly, 1/3 people are allergic to collagen. Suitable for people: people whose lips are not full enough and just need to open their lips slightly. Operation time: This operation has low technical content and can be completed within 10 minute. Duration of effect: this plump effect can only last for 2-6 months, and it needs multiple injections to keep the lip shape. Recovery time: normal life will not be affected after injection, and the lips feel natural.