Care for your hair的文章

Care for your hair的文章

We have about 100,000 hairs on our heads. Each hair shaft has three layers, with the cuticle, or outside layer, protecting the two inner layers.

Shiny hair is a sign of health because the layers of the cuticle lie flat and reflect light. When the scales of the cuticle lie flat they overlap tightly, so the inner layers are well protected from heat, sun, chlorine, and all the other hazards that can come from living in our environment. When hair is damaged, though, the scales may separate and hair can become dry. Because the scales on dry hair don't protect the inner two layers as well, hair can break and look dull.

The type of hair a person has - whether it's straight or curly - can also affect how shiny it is. Sebum, which is the natural oil on the hair, covers straight hair better than curly hair, which is why straight hair can appear shinier.

Depending how long a person's hair is or how fast it grows, the end of each hair shaft can be a couple of years old. So the hair at the end of the shaft could have survived a few summers of scorching sun and saltwater and winters of cold, dry air. How well you care for your hair from the time it emerges from the root plays a role in how healthy it looks.

caring for hair how you take care of your hair depends on the type of hair you have, your lifestyle, and how you style your hair. your hair type. people with dry, curly hair have different hair care needs than people with straight, fine hair. but all hair needs to be treated gently, especially when it's wet. wet hair can stretch, making it more vulnerable to breakage or cuticle damage. that's why using a hot blow-dryer (or other heat styling products) on very wet hair can damage it. some people find that their hair gets oily in their teen years. that's because the hair follicles contain sebaceous glands that make sebum, which moisturizes the hair and skin. during adolescence, the sebaceous glands may become overactive, producing more oil than needed. as with acne, oily hair is usually a temporary part of puberty. many teens care for oily hair by washing it once a day - or more if they're active. as long as you treat your hair gently when it's wet, frequent washing shouldn't harm it. if you have acne, it's a good idea to keep the hair around your face clean so hair oils don't clog your pores. if you're washing your hair every day or more, it may be better to choose a mild shampoo instead of a shampoo designed for oily hair. for some people - especially people with fine, fragile, or combination hair (hair that's oily at the crown but dry on the ends) - shampoos for oily hair can be too harsh. if you have oily hair and want to use a conditioner, choose one that's made for oily hair. if your hair is dry, it's a good idea to wash it less frequently. some people only need to wash their hair once a week - and that's fine. many people who have curly hair also have dry hair. curly and dry hair types are usually more fragile than straight hair, so you'll need to be especially careful about using heat styling products. shampoos made for dry hair and hair conditioners can help.

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