Liquid foundation should not be used for how long after opening

General foundation liquid can not be used for 1-2 years after opening. Generally speaking, cosmetic Oems have two shelf lives, one is the shelf life before opening and the other is the shelf life before opening.

The shelf life before opening is generally printed on the bottle in the form of Arabic numerals, while the shelf life is marked on the cosmetic bottle and the outer packaging box, generally marked with "nM", where "n" refers to the natural number, "M" represents the month, meaning that the product needs to be used up after opening for several months. The shelf life is generally six months to one year, as short as three months.

The shelf life of different products is different, among which the products with a longer shelf life are skin care cosmetics, while the shelf life of mascara and eyebrow dye is only 3-6 months. It should be noted that once the cosmetics are opened, they will come into contact with the air, which is easy to breed bacteria and become a hotbed for bacterial growth. As long as cosmetics produce abnormalities, such as discoloration, stale taste, should immediately stop using.

Second, after the shelf life, the product may lose its anti-corrosion role, resulting in microbial growth, discoloration, delamination, mildew, stale and other phenomena. If such a phenomenon of liquid foundation/other cosmetics, continued use will lead to dermatitis, breakouts, clogged hair follicles, eye infections, lips ulceration and other skin problems.