To be exact, it takes about 63,000 to make the whole face tissue and more than 50,000 to transplant the cortex, so it takes 1 1 10,000 to120,000 to make the whole face. Skin and soft tissue expansion is to implant a skin expander and bury it under the skin or muscle layer. By injecting normal saline into the dilator regularly, the expansion sac is expanded, which leads to skin stretching and expansion.