However, the theoretical shelf life after opening is one year, so it is suggested to use it up within 3-4 months after opening in real life, because the unopened moisturizing water is affected by bacteria and microorganisms in the air, which will accelerate the oxidation speed of moisturizing water and lead to the loss of its efficacy. Jane is actually a moisturizing water with more effective ingredients than toner, and it can also be called essence water.