[Ran^Text^Library] "I have been working in the education system for so many years, and I think that my research on Chinese grammar should be at the expert level, but after appreciating Brother Zhang's level today, I suddenly feel a little embarrassed, it seems that you are the real expert-Le-Wen-Xiao-Said-" Jiang Ping admired.

"Generally so, the brother is only the third in the world."

"Since you're the third, what about the first and second?" Jiang Ping asked.

"The first is dead, and the second is heaven."

"Haha! I said Brother Zhang, you are too funny, after a while, you are still the first? Zhang Zheng's nonsense made the big beauty Jiang Ping almost laugh and couldn't straighten her waist.

"It's just a joke. Sister Jiang, after laughing, do you feel much more relaxed? ”

"It's not just relaxed, it's so comfortable."

"The statement that a smile is less than ten years, although it is a bit exaggerated, but laughter is indeed beneficial to physical health, and if you smile often, there will be fewer crow's feet on your face." Zhang Zheng said.

"Brother Zhang, your secret can't be this 'laugh', right?"

"Of course not. In fact, the reason why the skin of those sisters and sisters is so well maintained is mainly because they use a kind of cosmetics......"

"Wait Brother Zhang, do you mean that the reason why they maintain so well is because they use cosmetics?" Jiang Ping asked.

"Sister Jiang is right, it's true."

"No, I have used almost all domestic cosmetics, and I have also used a lot of some foreign brand-name cosmetics, I can't say that there is no effect, but the effect is indeed very average, compared with the effect of these sisters, it is simply a heaven and an underground." Jiang Ping said.

"Whether it has an effect or not, first of all, we should figure out what cosmetics are, and secondly, we should figure out what the main function of cosmetics is......"

"Then you can give everyone the knowledge of cosmetics."

"Okay. The so-called cosmetics refer to chemical industrial products or fine chemical products that are spread on the surface of the human body, such as skin, hair, fingernails, lips and teeth, etc., by smearing, spraying or other similar methods. Their main role is to cleanse, protect, beautify, modify the skin or correct the body odor. Zhang Zheng introduced.

"But why aren't they so obvious?"

"From the functions of cosmetics I just introduced, it is not difficult to find that all the cosmetics on the market only have the function of protecting the skin, and do not change the characteristics of the skin......

"No, other manufacturers said that the human body can change the state of the skin by absorbing the nutrients in cosmetics through the skin." Jiang Ping said.

"That's all nonsense. As you know, the skin is mainly composed of the epidermis, dermis and subcutaneous tissue. The outermost layer is the stratum corneum, which is firm and compact, effectively preventing the invasion of bacteria, harmful chemicals, and pathogens. On the surface of the stratum corneum, there is also a film composed of lipids and other substances, which makes the skin impermeable, so it is difficult for most foreign ingredients, including nutrients in cosmetics, to be completely absorbed by the body through the stratum corneum. Therefore, the amount of active ingredients in cosmetics that penetrate into the skin is negligible and negligible. ”

"Won't it?"

"Absolutely. Imagine if the skin could absorb foreign ingredients, what would become of swimmers who soaked in water all day long? ”

"It's going to be a big fat pig." Yu Lei said.

"Brother Zhang, it sounds like what you said is very reasonable, the question is, since it is difficult for the skin to absorb foreign nutrients, isn't cosmetics useless?" Jiang Ping said.

"The effect is still there. The real functions of cosmetics are as follows: First, moisturizing. For example, petroleum jelly, glycerin, etc., they can form an oil film on the surface of the skin, which can prevent the evaporation of water in the skin; The second is grinding. Some cosmetics with solid particles can help rub off the keratin in the thick stratum corneum (such as the heel), making the skin look supple and delicate for a short time. The third is covering and coloring. The use of cosmetics such as foundation, eyebrow pencil, eyeliner, eyeshadow, and lip gloss can play a role in covering skin imperfections and changing skin tone; Fourth, sun protection. Sunscreen cosmetics can block some ultraviolet rays and prevent skin damage, so cosmetics are still very effective for beauty. ”

"You're right, cosmetics do have a noticeable effect in these areas." Jiang Ping said.

"But it's worth noting that all of the above effects have nothing to do with absorption, and any cosmetics that claim to contain nutrients that can absorb nutrients from the skin are foolish. At the same time, cosmetics do not have any function to improve the characteristics of the skin, and all cosmetics that claim to be anti-aging, wrinkle-relieving, skin texture, whitening and other effects are all scams. ”

"You're so right, I used so many so-called anti-wrinkle creams and didn't get rid of my crow's feet, I thought it was my own problem. But you have to say, doesn't the skin need nutrients? Jiang Ping asked.