Hair care

Hair grows from the skin on our head.

Our skin makes a special oil. This oil keeps hair shiny. It also helps protect the hair.

We use shampoo to wash hair. Shampoo helps clean away dirt. It also washes away extra oil.

Some people change how hair looks. They can change the color. They can use tools to style it.

Brushes and clips help us style hair. It is fun to try new looks!

Hair care is how we look after our hair.

Hair grows from the skin on your scalp. The living parts of the hair stay under the skin. The part you can see is called the hair shaft. This part is not alive. You cannot fix damage to the hair shaft once it grows out. You can only manage it to keep it healthy.

Your scalp makes a natural oil called sebum. This oil keeps hair shiny and moist. It also helps protect the hair and skin. You can move this oil down your hair by brushing it. If you have too much oil, your hair may look greasy.

We use shampoo to clean our hair. Shampoo helps wash away dirt, sweat, and extra oil. Some shampoos use sulfates to make bubbles. These can strip away natural oils.

Many people like to change their look. You can use tools like clips or brushes. You can also change the color of your hair. Some people use herbs like henna to add color. Others use heat to change if hair is curly or straight.

Hair care is the way we look after our hair and the skin on our scalp. People all over the world have different routines for their hair. These routines depend on a person's culture and how their hair looks. Some people choose to color, trim, or shave their hair. Others use special methods like waxing or threading to remove hair. You can find hair services at salons, barbershops, or day spas. Many people also use products at home to keep their hair looking good.

It is important to know how hair actually grows. The living parts of the hair stay hidden beneath your skin. These include the hair follicle, the root, and the sebaceous gland. The part of the hair you can see is called the hair shaft. This shaft is not alive, so it cannot fix itself if it gets damaged. You can only manage the hair shaft to keep the outer layer, called the cuticle, healthy. Keeping your scalp skin clean helps your body grow healthy hair.

Your scalp has tiny glands that make a natural oil called sebum. This oil is made of fatty acids and helps protect your skin. It gives your hair moisture and a nice shine as it moves down the shaft. You can help move this oil by brushing or combing your hair. Sebum also helps keep the scalp's natural pH between 5 and 6.8. This slightly acidic level helps stop tiny germs from growing. However, too much oil can block your hair follicles and cause dandruff.

When we wash our hair, we use a special soap called shampoo. Shampoo is a surfactant, which is a substance that helps water mix with oil. The shampoo molecule has a head that loves water and a tail that loves grease. This allows the shampoo to soak into the hair and grab onto dirt. The physical act of washing turns the dirt into an emulsion that rinses away. Some shampoos have sulfates to make lots of foam. But sulfates can sometimes strip away the natural oils your hair needs.

People use many tools to change how their hair looks. You might use a hair dryer, a comb, or even a hair iron. Some people use chemicals to change their hair color or texture. This is called chemical alteration. You can use dyes to add pigment or bleach to remove it. Some people prefer natural options like henna or indigo from plants. You can also use heat to make hair curly with a perm. It is important to be gentle with hair that has been changed this way.

Hair care is the practice of maintaining the hygiene and appearance of hair. This includes hair on the scalp and other areas like the face or body. People follow different routines based on their specific culture. They also adapt their care to the physical characteristics of their hair. Some people choose to trim, color, or shave their hair. Others use methods like waxing, sugaring, or threading for hair removal.

To understand hair care, one must understand how hair grows. The living parts of the hair exist beneath the skin. These include the hair follicle, the hair root, the root sheath, and the sebaceous gland. The visible part of the hair is called the hair shaft. The shaft consists of the medulla, the cortex, and the outer cuticle. Because the shaft has no living processes, it cannot repair itself. You can only manage the shaft to keep the cuticle intact.

The scalp contains sebaceous glands that produce a substance called sebum. Sebum is composed primarily of fatty acids. It protects the hair and skin by providing moisture and shine. It also helps maintain a slightly acidic pH between 5 and 6.8. This acidity can inhibit the growth of microorganisms. Sebum is distributed down the hair shaft mechanically through brushing and combing. However, excess sebum can block hair follicles. This blockage may be caused by dandruff or dead skin.

Cleaning the hair involves removing excess sweat, oil, and products. Most people use shampoo, which is a specialized surfactant. A surfactant is a substance that helps water and oil mix. Shampoo molecules have a head that attracts water and a tail that attracts grease. This process is called the wetting action. The physical act of washing creates an emulsion of dirt and oil. This emulsion is then rinsed away with water. This is known as the emulsifying action.

Many shampoos contain sulfates to create a foaming effect. However, sulfates can strip away natural oils and hair dye. Because of this, sulfate-free shampoos are often used for color-treated hair. Most shampoos have a pH level between 4 and 6. Acidic shampoos are common because they do not swell the hair shaft. They also help maintain natural oils. Maintaining the scalp's microbiome is a major focus in modern hair care.

People use various tools and cosmetics to style their hair. Tools include hair dryers, combs, hair irons, and hair rollers. Cosmetics include hair gel, mousse, serum, and hair spray. Chemical alteration can also change the perceived color or texture. This includes perming to change curls or bleaching to remove pigment. Permanent alterations to the hair structure are not currently possible. Any chemical changes only affect the hair above the scalp. New hair will grow in with its natural color if the roots are healthy.

Chemical processes can sometimes cause damage like trichoptilosis. This is the formal name for split ends. It happens when the protective cuticle is stripped away. This causes the hair fiber to split longitudinally. This damage can be caused by heat, chemicals, or physical trauma. The ends of long hair are often considered "old" after 10 centimeters. They have faced more sun, shampoo, and heat than the rest of the hair. This makes them dry and brittle.

Hair care also involves safety and professional standards. In many industries, workers must contain their hair to prevent injury. The food industry requires this for public health reasons. In sports, hair must be kept out of the eyes for safety. Even on motorcycles, long hair is often contained for safety. Manufacturers use clinical and preclinical assessments to ensure product safety. They may even use ex-vivo hair follicle models to test efficacy. This helps ensure products meet global regulatory standards.