The ultraviolet rays in the sun are harmful to our skin. Long-term light will cause the skin to accelerate aging, increase the precipitation of melanin, sunburn, and it will form stains for a long time. We need sun umbrellas, sun hats, Sunblock Cream, etc. to help us reflect, isolate, and reduce the damage of ultraviolet rays to our skin. The principle of Sunblock Cream for face is divided into physical sunscreen and chemical sunscreen.
Physical sun protection, using reflective particles, such as titanium dioxide and zinc oxide, to reflect and scatter light, so that the amount of ultraviolet rays reaching the skin can be reduced to achieve the purpose of sun protection.
Physical sunscreens are commonly used: titanium dioxide and zinc oxide. Titanium dioxide: can completely block UVB, but can only block UVA with shorter wavelengths, and cannot block longer light waves. Zinc oxide: It is an important and widely used physical sunscreen. The principle of shielding ultraviolet rays is absorption and scattering, which can block almost all wavelengths of UVA and UVB, and has high safety.
Advantages: high safety, good stability, sunscreen immediately after application, no need to wait. Because it will not photodegrade, it can reflect ultraviolet light for a long time, as long as it does not sweat or wipe, it will maintain the sun protection effect. There is no chemical reaction, so it is gentle on the skin and especially suitable for sensitive skin.
Disadvantages: The pure physical sunblock refreshing cream will turn white on the face, sticky, and have a slightly thicker texture, but there is still a big difference between poor raw material composition and better feeling of use.
Special Tips: Ultra-fine zinc oxide, in addition to reflection, also absorbs ultraviolet rays.
Chemical sunscreen is achieved by absorbing harmful ultraviolet rays. Since chemical sunscreen molecules are absorbed by the skin, the process of absorbing ultraviolet rays occurs inside the skin and is eliminated by the body's metabolism.
Chemical sunscreens are commonly used: octocrelin, etc. Chemical sunscreens can be divided into UVA sunscreens and UVB sunscreens according to the different wavelengths of UV absorption.
Advantages: The texture is light and non-sticky, and the skin does not feel heavy after application.
Disadvantages: poor light stability, photodegradation, long-term sun exposure, you need to reapply repeatedly (if the sunlight is not very strong, you can reapply sunscreen spray). And because it is absorbed by the skin, the sunscreen effect is activated inside the skin, so it has a certain irritation to the skin (the higher the SPF, the easier it is to cause irritation).
Special attention If you choose chemical sunscreens containing lead and mercury, long-term use will cause skin dependence and damage skin cells and structures.
But in fact, Sunscreen Gel Cream is not applied as you want. Only reasonable and correct use can bring better sunscreen effect, otherwise it will be counterproductive. Here is a detailed introduction to how to use sunscreen in the most reasonable way and how to use sunscreen correctly.
1. Choose the sunscreen that suits your skin type
If you are oily skin, you can choose a sunscreen with a strong water-based and oil-free formula. Dry skin can choose sunscreen with strong hydration. For sensitive skin, it is best to choose a pure physical sunscreen, or choose a sunscreen with the description text "No fragrances, preservatives, etc.".
2. Apply sunscreen correctly
First, thoroughly clean the face, then apply toner, lotion, cream and other hydrating products, and then apply an appropriate amount of sunscreen to the face. When applying it, gently pat it to promote absorption without rubbing mud. After applying the face, apply evenly on the neck and behind the ears.
3. The correct application time of sunscreen
Generally, it is better to apply it half an hour before going out, because sunscreen is not effective immediately after applying it. The sunscreen ingredients in it take time to absorb, so it is better to apply it in advance.