　 First, under normal circumstances, the shelf life of cosmetics is within two or three years.
The packaging or bottle of cosmetics usually has the production date and shelf life of the product. Under normal circumstances, the shelf life of the cosmetics is within two or three years. Therefore, if the product is used within two or three years after the product is opened, there is quality assurance, so don't worry about the problem. .
　　 Second, general skin care products should be used up after six to 12 months.
Although the shelf life of skin care products is also within two or three years, skin care products should be used up within six to twelve months after opening, and they can no longer be used after more than twelve months. In addition to skin care products, there are some cosmetics as well.
　　 Third, cosmetic discoloration, fermentation, oil-water separation, spotting and mildew
When the original color of the cosmetic changes, the makeup produces bubbles or strange smell, the cosmetic appears greenish yellow or black mildew, the makeup becomes thin and water, the cosmetic appears floc or divergence, it can be basically judged that the cosmetic expires.
According to the above three points, it can be judged whether the cosmetics are expired. If you are worried that you don't remember the date of manufacture or the opening time of the cosmetics, it is better to buy some labels to write the date of manufacture and opening time of the cosmetics, and check it out regularly. !