Avoid sun exposure: cosmetics should not be stored in direct sunlight or light. Light irradiation will cause water evaporation of cosmetics, and some ingredients will lose efficacy. Ultraviolet irradiation will cause chemical changes of some ingredients, such as paste drying shrinkage, oil-water separation and other phenomena, affecting the original efficacy.

Fear of cold and heat: please do not freeze the cosmetics. It is not suitable to put them outside for a long time in winter. Freezing will cause the cosmetics to freeze and crack. After thawing, oil-water separation and poor stability will occur. The overheated environment will affect the stability of cosmetics and shorten its shelf life.

Fear of damp: some cosmetics contain protein, which is prone to mildew after damp. If the packaging is made of glass bottle with iron cover, the iron cover is easy to rust and corrode the cosmetics after being damped.

Be afraid of dirt: after using cosmetics, it is necessary to tighten the bottle cap in time. It is better to avoid taking cosmetics directly by hand, or pay attention to hand hygiene when taking them. If you take too many cosmetics at one time, don't put them back into the bottle again, so as to prevent bacteria and other microorganisms from invading and multiplying, causing a series of skin problems.