Can sunscreen still be used after one year of opening? It can be used but the effect is not good.

Can sunscreen still be used after being opened for a year? Many girls know that they should apply sunscreen when going out, but many people think that it is only necessary in summer, so they often save the sunscreen for use the following year. So can sunscreen still be used after one year of opening? Let's take a look~

Can sunscreen still be used after one year of opening?

Sunscreen can be used one year after opening if it has not exceeded its shelf life, but it is recommended that girls should not use sunscreen after opening for one year. Because after the sunscreen is opened, as the number of times it is used increases, the number of times it comes into contact with bacteria and microorganisms in the air will also increase, thus affecting the sunscreen ingredients inside. So if you open your sunscreen and use it again after a year, it won’t have the same sun protection effect as before.

What happens if you use sunscreen a year after opening it?

The sun protection effect is greatly reduced

If you use sunscreen one year after opening it, the first thing that will be affected is its sun protection effect. Because if the sunscreen is opened, the active ingredients in the sunscreen will begin to evaporate and become ineffective as the number of uses increases. So if girls open the sunscreen and use it a year later, the effect of the sunscreen will definitely be greatly reduced, and it will not be able to achieve the best sun protection effect.

Cause skin allergies

If sunscreen is used again one year after opening, it is likely to cause skin allergies. Because after the sunscreen is opened, it will definitely be affected by the bacteria in the air. The more times it is used, the more bacteria will enter. If it is stored for another year, it is possible that the entire sunscreen has been contaminated. Therefore, if it is used again, it is easy to cause allergic symptoms such as redness, swelling, hotness, and tingling on the skin.