A hairstyle, hairdo, or haircut refers to the styling of hair, usually on the human head. The fashioning of hair can be considered an aspect of personal grooming, fashion, and cosmetics, although practical, cultural, and popular considerations also influence some hairstyles.
* 1 Factors that define a hairstyle
* 2 Hairstyle process
o 2.1 Length and trimming
o 2.2 Brushing and combing
o 2.3 Drying
o 2.4 Braiding and “Updos”
* 3 An industry
o 3.1 Hairstyling tools
o 3.2 Hairstyling products
o 3.3 Wigs
o 3.4 Functional and decorative ornaments
* 4 Hairstyle as event
* 5 See also
* 6 Notes
* 7 References
Factors that define a hairstyle
Japanese women and girls in Western dress with various Western hairstyles. 1 September 1887.
A hairstyle's aesthetic considerations may be determined by many factors, such as the subject's physical attributes and desired self-image or the stylist's artistic instincts.
Physcal factors include natural hair type and growth pattern, face and head shape from various angles, and overall body proportions; medical considerations may also apply. Self-image may be directed toward conforming to mainstream values (military-style crew cuts or current "fad" hairstyles such as the Dido flip), identifying with distinctively-groomed subgroups (e.g., punk hair), or obeying religious dictates (e.g., Orthodox Jewish have payot ,Rastafari have Dreadlocks or the Sikh practice of Kesh , though this is highly context-dependent and a "mainstream" look in one setting may be limited to a "subgroup" in another.
Hairstyling may also include adding accessories (such as headbands, barrettes, to the hair to hold it in place, enhance its ornamental appearance, or partially or fully conceal it with coverings such as a kippa, hijab, tam or turban.
 Hairstyle process
Most cosmetology programs in the United States require students to purchase practice heads that are made with real human hair. Students can cut, color and add permanents as they are trained in the procedures.
Hair dressing may include cuts, weaves, coloring, extensions, perms, permanent relaxers, curling, and any other form of styling or texturing.
Length and trimming
Hair cutting or hair trimming is intended to create or maintain a specific shape and form. Its extent may range from merely trimming the uneven ends of the hair to a uniform length to completely shaving the head.
The overall shape of the hairstyle is usually maintained by trimming it at regular intervals. There are ways to trim one's own hair but usually another person is enlisted to perform the process, as it is difficult to maintain symmetry while cutting hair at the back of one's head. Although trimming enhances the hair's appearance by removing damaged or split ends, it does not promote faster growth or remove all damage along the length of the hair.
Stylists often wash a subject's hair first, so that the hair is cut while still slightly damp. Compared to dry hair, wet hair can be easier to manage in a cut/style situation because the added weight and surface tension of the water cause the strands to stretch downward and cling together along the hair's length, holding a line and making it easier for the stylist to create a form.
Brushing and combing
Brushes and combs are used to organize and untangle the hair, encouraging all of the strands to lie in the same direction and removing debris such as lint, dandruff, or hairs that have already shed from their follicles but continue to cling to the other hairs.
There are all manner of detangling tools available in a wide variety of price ranges. Combs come in all shapes and sizes and all manner of materials including plastics, wood, and horn. Similarly, brushes also come in all sizes and shapes, including various paddle shapes. Most benefit from using some form of a wide tooth comb for detangling. Most physicians advise against sharing hair care instruments like combs and clips, to prevent spreading hair conditions like dandruff and head lice.
The historical dictum to brush hair with one hundred strokes every day is somewhat archaic, dating from a time when hair was washed less frequently; the brushstrokes would spread the scalp's natural oils down through the hair, creating a protective effect. Now, however, this does not apply when the natural oils have been washed off by frequent shampoos. Also, hairbrushes are now usually made with rigid plastic bristles instead of the natural boar's bristles that were once standard; the plastic bristles increase the likelihood of actually injuring the scalp and hair with excessively vigorous brushing.
Hair dryers speed the drying process of hair by blowing air, which is usually heated, over the wet hair shaft to accelerate the rate of water evaporation.
Excessive heat may increase the rate of shaft-splitting or other damage to the hair. Hair dryer diffusers can be used to widen the stream of air flow so it is weaker but covers a larger area of the hair.
Hair dryers can also be used as a tool to sculpt the hair to a very slight degree. Proper technique involves aiming the dryer such that the air does not blow onto the face or scalp, which can cause burns.
 Braiding and “Updos”
Tight or frequent braiding may pull at the hair roots and cause traction alopecia. Rubber bands with metal clasps or tight clips, which bend the hair shaft at extreme angles, can also have the same effect.
If hair is pinned too tightly, or the whole updo slips causing pulling on the hair in the follicle at the hair root are other scenarios that can cause aggravation to the hair follicle and result in headaches. Although many African- Americans use braiding extensions as a form of convenience, it is important not to keep the braids up longer than needed to avoid hair breakage or hair loss.