一级毛片免费完整视频

What are the standards for healthy skin?
- Mar 26, 2020 -

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Although the standards of beauty are different in different countries, different nationalities, and even in different regions, different historical times, and different classes of people, some standards are common.

1. Skin elasticity: Under normal circumstances, the dermis layer of the skin has elastic fibers and collagen fibers, and the subcutaneous tissue is rich in fat, which makes the skin rich in elasticity and looks bright and smooth. With age or disease, the skin gradually ages, the dermal layer shrinks and becomes thinner, the elastic fibers and collagen fibers of the skin degenerate, the elasticity decreases, the hyaluronic acid decreases, the skin loses elasticity, the skin relaxes, and wrinkles appear.

一级毛片免费完整视频2. Moisturizing the skin: There are abundant blood vessels and lymphatic vessels in the dermis, which is the second largest "reservoir" in the human body after muscles. Keeping the skin moist is the prerequisite for the skin to be moist and shiny, and it has an important role in maintaining the skin's nutrition and preventing skin dryness and wrinkles.

一级毛片免费完整视频3. Skin color and texture: The color of the skin varies with different color races, including white, yellow, brown, red, and black. This is mainly due to the different amount and distribution of pigments in the skin.

一级毛片免费完整视频4. Skin cleanliness and vitality: The skin should be free of dirt and stains, and always kept clean.

5. Skin is normal and resistant to age: Normal skin should be non-sensitive, non-greasy and non-drying.

一级毛片免费完整视频In short, beautiful skin should be healthy skin, ruddy and shiny, soft and delicate, strong and elastic and vibrant, neither rough nor greasy, shiny and rarely wrinkled.

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