Generally speaking, you can see a more obvious face-lifting effect one week after injecting face-slimming injections. But everyone’s physique is different, and the effects will vary from person to person. For example, a small number of people can already see effects 3 days after injection, while others may have to wait one to two weeks. Therefore, if you see that the face-slimming injection does not work immediately, don’t worry too much. Most people can achieve the best face-slimming effect after two months.