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.
Physical 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 cut 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 contextual and a "mainstream" look in one setting may be limited to a "subgroup" in another.
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.
Hairstyling tools may include hair irons (including flat, curling, and crimping irons), hair dryer, and hair roller. Hair dressing might also include the use of hair product to add texture, shine, curl, volume or hold to a particular style.
Hair Styling Products
Styling products aside from shampoo and conditioner are many and varied. Leave in conditioner, conditioning treatments, mousse, gels, lotions, waxs, creams, serums, oils, and sprays are used to change the texture or shape of the hair, or to hold it in place in a certain style. Applied properly, most styling products will not damage the hair apart from drying it out; most styling products contain alcohols, which can dissolve oils. Many hair products contain chemicals which can cause build-up, resulting in dull hair or a change in perceived texture.