Hair is genetically programmed to be straight, curly or wavy, and it tends to change over time.
Hair texture is measured by the degree of which one's hair is either fine or coarse, which in turn varies according to the diameter of each individual hair. There are usually four major types of hair texture: fine, medium, coarse and wiry. Within the four texture ranges hair can also be thin, medium or thick density and it can be straight, curly or wavy. Hair conditioner will also alter the ultimate equation and can be healthy, normal, oily, dry, damaged or a combination. Hair can also be textured if straighteners, crimpers, curlers, etc are used to style hair. Also, an expert hairdresser can change the hair texture with the use of special chemicals.
Depending on the hair type, repeated use of hair straighteners, like most other heat styling tools, can cause varying amounts of damage such as split ends, thinning of the hair shaft and even causing hair to become brittle and prone to breakage. Generally, after extensive damage, hair will show signs of dryness and display an unhealthy appearance.
High-end modern hair straighteners have ceramic heating elements, which cause less damage to hair, are more effective and heat up faster than non-ceramic coated heating plates. Less expensive brands usually do not have ceramic heating elements though some may have a paint-like coating that gives the appearance of ceramic plating.
Based on the materials used in the heating plates, hair irons can be classified as ceramic, tourmaline and traditional metal flat iron. Ceramic hair irons are believed to be gentle to the hair.
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