How long can nail polish be kept? Can nail polish still be used after it expires?

Nail polish is a cosmetic product that we are all familiar with. Many girls like to wear nail polish, and nail polish also has a certain shelf life. So we need to know how long nail polish can be stored? Can nail polish still be used after it expires?

Generally speaking, the shelf life of nail polish is 12 months, and if the unopened nail polish is stored properly, the shelf life is about 18 months. Expired nail polish is more volatile than normal nail polish, and has greater side effects on nails. Nail polish should be stored away from light and placed in a cool place, and the bottle cap should be tightened in time after each use. A simple way to determine whether a bottle of nail polish is expired is to see whether the texture of the nail polish appears thick and easy to clump. In addition, the shelf life of nail polish of different brands may be different. The exact shelf life can be found in the product manual. The texture of nail polish is the most direct way to determine whether nail polish is expired. Compared with new factory nail polish, nail polish with an earlier production date will appear thick and easy to clump, and it is not easy to apply evenly when used.

Nail polish cannot be used after it expires. Expired nail polish cannot be evenly applied to the nails. Not only will it become thick after being applied to the nails, but it is also easy to clump. Therefore, it is not recommended to continue using it. The ingredients of ordinary nail polish are composed of two categories. One is the solid ingredients, mainly pigments, glitter, etc.; the other is the liquid solvent ingredients, mainly acetone, ethyl acetate, phthalates, formaldehyde, etc. The texture of nail polish is the most direct way to determine whether the nail polish is expired. Compared with the new factory nail polish, the nail polish with an earlier production date will appear thicker, easier to clump, and it is not easy to apply evenly when used. This is because over time, the various ingredients in the nail polish begin to clump, and it is no longer easy to mix them together. Like all other cosmetics, if stored properly, the shelf life and use period of nail polish will be extended accordingly. First of all, nail polish needs to be stored away from light and placed in a cool place, because light and heat will dry the nail polish. Do not keep the bottle open for a long time each time you use it. After use, tighten the bottle cap and store it. Air entering the bottle will greatly shorten the service life of the nail polish.

Nail polish contains a large amount of chemical solvents, generally accounting for 70%, such as toluene, ethyl acetate, ethanol, phthalates, formaldehyde, etc., which are commonly known as "banana water". They are very harmful to the human body. Among them, phthalates will hinder the normal balance of hormones, cause serious reproductive damage, and cause other health problems. Benzene and formaldehyde are both carcinogens. When carrying fried food or pastry, when the nails come into contact with the food, some toxic substances will dissolve in the oil and enter the human body. It is extremely harmful. Before applying nail polish, it is best to apply a layer of nail base oil to protect the health of the nails, and at the same time make the nail polish easier to color and last longer. The darker the color of the nail polish, the greater the damage to the nails, and it is easier to make the nails turn yellow, so it is best to apply it for 2 to 5 days and then let it rest for two days. The technique of applying nail polish is to apply the middle of the nail width, apply a nail from the nail base to the nail tip, and then apply it on both sides. This can avoid the most common thickness problem and save unnecessary modifications.

After applying the nail polish, the light is on for too short a time, which will result in the nail not drying. If the light is not on for enough time, you need to replace the lamp in time or extend the light time to solve the problem. If the nail polish is applied too thickly at one time, it will not dry well and may shrink. Therefore, apply a small amount of nail polish at one time and do not apply it too thickly at once. The nail polish will fall off easily without a sealing layer, so a sealing layer is needed first. Deal with the dead skin and dust on the surface of the nails, apply a thin layer of base glue, then apply a thin layer of colored nail polish, shine the light for three to five minutes, apply the second layer of colored nail polish, and finally apply a sealing layer to complete.