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an on-line reference by Dr. John Gray,
provided by the P&G Hair Care Research Center.
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Page 66 -- HAIR CONDITION

hair care Hair Damage Needs Hair Conditioner Cosmetic Hair Treatments

Hair in good condition

In the end, the condition of hair depends on what is done to it. You are your own hair's worst enemy!
    By the time your hair reaches your shoulders, it has probably been growing for three years or more. Hair that is level with your waist is around five years old (at least at the tip). If you are lucky enough to have hair long enough to sit on, that hair maybe as much as a dozen years old. And throughout its growth it needs to be cared for to keep its healthy look. A damaged cuticle cannot heal, because the scales are 'dead', although much can be done to help its appearance.

The golden hair of the imprisoned fairy-tale princess Rapunzel was long enough to allow her lover to climb it in order to reach her in her tower - a demonstration not only of the length of anagen in Rapunzel, but also of the inherent strength of hair

This man is head of a religious cult which requires its leader to be able to grow his hair long enough to reach the ground: his anagen period is probably around ten or twelve years. As he grows older and the anagen period shortens, he may lose his job
 

natural blonde hair

The straight blonde hair of this tanned young woman is naturally sun-bleached, and reflects light well


    If you are sensible, you clean your hair frequently, using good-quality products, and -most importantly - remember to condition it well. You have the ends cut regularly by a skilled stylist, so as to prevent weathering effects such as split ends. If you are thinking of changing your hair color you get advice first from an experienced hair technician, who can tell you how much color change your particular hair can stand, and which hair coloring products would be suitable. If you are considering a perm you ask for advice on whether your hair type can stand perming at the moment, or if it would be safer to improve its condition first. And, once permed, you pay even more attention to conditioning your hair, and you don't repeat the perm too often.
    With an understanding of the principles of good hair care, and regularly putting those principles into practice, everyone can aim to keep their hair in good condition.

Hair in poor condition

The natural look of your hair depends on several inherited factors. Hair that is in poor condition looks dull and dry. So how does it get that way?
    Dark hair, as we have seen, looks glossier than blond hair. The presence or absence of natural oils makes a difference. And very straight hair reflects light better than tousled hair does.

hair care Hair Damage Needs Hair Conditioner Cosmetic Hair Treatments