Hyaluronic acid injection can obviously improve nasolabial groove. Many patients only show moderate nasolabial groove, which can be filled with a finished preparation. For deep nasolabial groove, 1 injection can not achieve obvious improvement effect, and it can be injected again after 2-4 weeks. If the nasolabial groove is not obvious, a small amount of injection can bring obvious improvement, and the remaining hyaluronic acid can be used to treat other mild facial wrinkles. When injecting hyaluronic acid into nasolabial groove, most patients do not need any form of anesthesia, and a few patients with weak pain tolerance can undergo infiltration anesthesia around the operating area.
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