Hair care
Hair care encompasses hygiene, cosmetology, and cultural practices.
Hair care encompasses the hygiene and cosmetic practices related to hair on the human scalp, as well as facial, pubic, and other body hair to a lesser extent. Routines vary based on cultural background and the natural properties of a person’s hair. Common treatments include coloring, trimming, shaving, plucking, or removal methods like waxing, sugaring, and threading. Professional services are available at salons, barbershops, and day spas, while products for home use are sold commercially. In the United States, laser hair removal and electrolysis are performed by licensed professionals in medical offices or specialty spas.
The care of hair and the scalp are closely linked, as hair grows from beneath the skin. The living parts—the follicle, root, root sheath, and sebaceous gland—are located under the skin, while the visible hair shaft (cuticle, cortex, and medulla) has no living processes. Damage to the shaft cannot be repaired biologically, but the cuticle can be managed to maintain its integrity. A healthy scalp is essential for overall body health and hair production. Regular cleaning of the scalp is important, but for those with rough hair or hair loss issues, it can sometimes lead to further shedding. Not all scalp problems stem from bacterial infections; some have unknown causes, and only symptoms like dandruff can be treated. Head lice, a common hair and scalp issue worldwide, requires careful removal and is not linked to poor hygiene; in fact, studies show lice prefer clean hair. Washing hair is more about cleaning the scalp surface, similar to hygiene for the rest of the skin.
Sebaceous glands produce sebum, a substance made mostly of fatty acids that protects hair and skin and inhibits microorganism growth. Sebum contributes to the skin’s slightly acidic pH, typically between 5 and 6.8. This oil travels down the hair shaft, providing moisture and shine while preventing dryness and absorption of external substances. However, excess sebum can clog hair follicles, often due to dandruff or dead skin, potentially hindering hair growth. Brushing and combing distribute sebum mechanically. When too much is present, the roots may appear oily, greasy, and darker, and the hair may clump together.
Washing hair removes excess sweat, oil, and product residue, typically done during a shower or bath with shampoo, a specialized surfactant.
- Field
- Hygiene and cosmetology
- Known for
- Hair cleaning, conditioning, styling, and chemical alteration
- Related services
- Salons, barbershops, day spas, medical offices
- Common treatments
- Waxing, sugaring, threading, laser hair removal, electrolysis
Lore & Background
The living parts of hair (hair follicle, hair root, root sheath and sebaceous gland) are beneath the skin, while the actual hair shaft which emerges has no living processes. Damage or changes made to the visible hair shaft cannot be repaired by a biological process, though much can be done to manage hair and ensure that the cuticle remains intact. Scalp skin must be kept healthy to ensure healthy hair production. If the scalp is cleaned regularly by those who have rough hair or have a hair-fall problem, it can result in loss of hair. Not all scalp disorders are a result of bacterial infections; some arise inexplicably, and often only the symptoms can be treated for management of the condition (example: dandruff). Head lice is probably the most common hair and scalp ailment worldwide, and studies show it is not necessarily associated with poor hygiene; more recent studies reveal that head lice actually thrive in clean hair.
Reader's Guide
Hair care is significant for both hygiene and aesthetic expression, with practices varying widely across cultures. The biological interplay between scalp health and hair production is central: sebum, produced by sebaceous glands, protects hair and skin but can cause blockage if excessive. Washing hair removes excess sweat, oil, and unwanted products; shampoos work through wetting and emulsifying actions. Sulfate-free shampoos are less harming on color treated hair. Chemical alterations such as perming, coloring, and straightening affect only hair above the scalp and can damage the cuticle, leaving hair dry or prone to breakage. The growing preference for natural and non-toxic hair dyes has led to increased demand for green products, though their complex pigmentation mechanisms remain largely unexplored. Hair care products are assessed for safety using ex-vivo hair follicle models and clinical and preclinical assessments in line with global regulations.
Did You Know?
- Head lice actually thrive in clean hair, according to recent studies.
- Sebum, composed primarily of fatty acids, gives hair moisture and shine and serves as a protective substance.
- Sulfates in shampoos are responsible for the foaming effect and can strip natural oils as well as hair dye.
- Permanent color changes require opening the hair cuticle with chemicals, which can leave hair dry, weak, or prone to breakage.
Frequently Asked Questions
Who is Hair care?
Hair care is the umbrella term for all hygiene and cosmetic practices applied to scalp hair, with secondary attention to facial and body hair. It covers everything from basic washing and conditioning to chemical processes like coloring and perm treatments.
What are Hair care's powers/role?
Its toolkit spans cleaning, styling, trimming, and a range of removal methods including waxing, sugaring, threading, laser hair removal, and electrolysis. These techniques serve both health maintenance and aesthetic goals.
Where does Hair care operate?
Professional services are available at salons, barbershops, day spas, and medical offices, while home routines depend on commercially sold products. In the U.S., procedures such as laser hair removal and electrolysis require a licensed practitioner.
Why is Hair care important?
It addresses both the physical health of the scalp and skin and the cultural, social, and personal identity dimensions of appearance. Specific routines are tailored to a person's cultural background and the natural characteristics of their hair.
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