According to Dr. Jiang, filling lacrimal duct with collagen can increase the volume of intradermal tissue through minimally invasive injection, thus shaping perfect skin. Collagen is mainly injected into the dermis with a very fine needle, and immediately after injection, it effectively fills the dermal structure collapsed due to aging, thus achieving the effect of immediately shaping the five senses. It is the best way to fill the sunken tear ditch with it, that is, micro-plastic wrinkle removal.