Is sunscreen really useful?

It is really useful to wear sunscreen, but it is not enough to have a layer of sunscreen to prevent tanning. Some students carefully apply sunscreen every day, but it will still turn black. Therefore, if you want to go out safely, you have to finish your homework! Let me share my experience.

First of all, we need to find out what sunscreen is for.

Sun protection mainly protects against two kinds of ultraviolet light waves: UVA and UVB.

UVB light waves will reach the dermis of the skin, causing sunburn.

UVA light waves will reach the dermis, leading to the production of melanin, which is also one of the reasons for skin aging.

Then, since I can prevent ultraviolet rays, why do I get black when I wear sunscreen?

First, the sunscreen is not long enough.

In fact, as long as you choose a sunscreen product that suits you, the rest is to apply it frequently. The most important thing in sunscreen class is to apply it regularly.

No matter how hot and toxic the sun is that day, don't expect the sunscreen applied in the morning to resist the ultraviolet rays of the day. Apply it in time to prevent it from getting dark accidentally. But for some girls, things like arms and necks are easy to fix, but it is more troublesome to apply makeup to the face with traditional sunscreen.

My suggestion is to prepare a sunscreen spray, which you will take with you when you go out in summer, because the spray can complete a large area of sunscreen in a short time, which is cooler and more suitable for high temperature weather.

Girls need to mend it, just spray sunscreen. But my suggestion is to apply it to a satisfactory thickness before putting on makeup. If you don't wear makeup, just apply a layer of sunscreen.

Second, improper selection of sunscreen

You should learn to distinguish your skin type. Mild physical sunscreen is suitable for sensitive muscles, and chemical sunscreen is light and thin. Students with oily skin can try it.

In addition, the ultraviolet index in different regions is different, and the ultraviolet index in spring, summer, autumn and winter is also different throughout the year. My recommendation is that you can choose the ordinary model in winter, after all, it is not necessary. In summer, ultraviolet rays are strong, so you need to choose a sunscreen with a higher SPF value.

Sunscreen will also be marked with SPF and PA, the former is a sunscreen product's protection against UVB; The latter is a sunscreen product's ability to protect against UVA. Therefore, according to the length of sunshine in different seasons, we should also choose the appropriate sunscreen to use.

Another tip:

First, the time point of sunscreen application

Wear sunscreen 0/5 minutes before going out. Don't apply it again before going out, because you should give your skin a certain time to absorb it. Try to make it up every two hours, because the ultraviolet rays at 1 1-4 pm are still very strong, so don't bother.

Second, other tools for sun protection are also necessary.

? ? Such as sun umbrellas, sun protection clothes, etc. Doesn't mean everything will be fine with sunscreen. Sunscreen will only reduce the degree of sunburn and sunburn.

Third, we should also pay attention to sun protection indoors.

? ? UVA in ultraviolet rays can penetrate through glass and clouds, so it exists indoors and outdoors, so it is also called "living ultraviolet rays". If you sit by the window where the sun can shine directly, the easiest way is to draw curtains with good shading effect.