Historically, the white hairs have been symbol of maturity and wisdom. Nevertheless; the present time, the mass media and the publicity of the companies that make dyes for the hair, have turned them an aesthetic problem, showing them as an evident sign of aging. 
The white hairs are hair without pigmentación, because, when it is aging, it is progressively diminishing the activity of the melanina, pigment responsible for the color of the hair. The genetics has much to do with the age in which they begin to appear the white hairs. 
The white hairs are distinguished of the rest of the hair and emphasize mainly in black hair style, as a consequence of three factors mainly; the genetic inheritance that is very important, stress of the modern life and to the successive nervous alterations due to all type of situations. 
The true is that the hair becomes white when losing the pigments that guive it color. Exactly this lack of pigments in some hair, continues being now a mystery and doesn’t exist therapy that gives back the color to the hair without pigments, the white hairs. Only there are cosmetic solutions in dyeing the hair with external pigments that can cover so much the healthy hair as the white hair 
It is for that reason that to the white hairs, these campaigns have given them more social value than physiological, and it has been one of the main reasons to do many things with the hair in name of the appearance

a)    Types of white hairs: 
Flexible;  appear in premature way; for which we considered a old person. They are flexible, they have the same aspect and vigour that can have the rest of our hair. 
Thick; that is more related with the age. The hair becomes rough and heavy.  
Yellows;  they become yellowish by the passage of time, giving it a sensation of hair neglected and very little attractive. In order to avoid that the hair is put yellowish there are specific shampoos for white hair that will make maintain the color white of the white hairs. 
b)   AREAS WHERE THEY APPEAR: 
The areas in which more frequently appear the white hairs are sienes and the front births. Contrary, the most obstinate part to than appears the white hairs is the nape. The fact that the white hairs appear in the zones where also falls the hair demonstrate that in these zones is where begin the hairy leather dysfunctions, possibly due to a smaller intensity of the blood suply. The white hairs can appear distributed by all the hair or concentrated in tufts. 
c)    is recommendable The dyeing of white hairs: 
Actually, is neither good nor bad. If you don’t want dye the hair, this will not change the situation of hair health. Dyeing it with guarantees and products of quality like you can find it in hairdressing salon they will cause that your hair loses health or that they increase the number of white hairs. Is just a cosmetic dissimulation. Is true that when the grey begin to appear, the hair with pigments tends to smooth itself and to give the sensation of much old person. Very people wish to cover these white hairs to be young and to continue seeming it. If that is your case, don’t hesitate. If you don’t like wear white hair that make you seem older, apply a dye to give it color. 

d)   the increase of white hairs: 
It’s not possible know really if when pull a grey hair, it will increase. The true is that we can neither affirm it nor deny it. Actually, it’s imposible to know how reacts each body. In principle, the fact to take a hair without pigment will not affect to which they are around but still there are many questions about how a grey hair forms. 
Nevertheless, stress is the cause of which to certain people they appear to them white before to others, reason that have relation with the hormonal alterations that are caused by certain emotional states. Then a strong displeasure, the death of someone dear, to work under a strong pressure and everything that causes stress to us can produce the appearance of white hairs; and not only after years of tension, but even in a few weeks. 

e)   Foods that slow down  the appearance of   the white hairs

In order to slow down the appearance of white hairs, it is recommended to consume rich foods in: 
Zinc; besides of its antialopécicas properties, it is  antirust  reason why it could help to prevent the lost of melanina. Between rich zinc foods, we have: celery,  asparagus,  borrajas,  higos,  potatoes,  bananas,  eggplants, etc.  
Copper;  besides to protect the hair, power the immunological system, is necessary for the growth of the childrens and takes part in the formation of the hemoglobina of the blood. 
A good source of this mineral we have it in the dry fruits like  hazelnuts,  the nuts  or in  soybean. 
Iron;  we have,  celery,  maize, the nuts, the peas,  spinach,  the endives,  carrots  or  cucumbers.  
Sílice;  we have integral  rice or  handle.  
Tiamina  (B1 Vitamin);  we have,  the sunflower seeds, integral cereals, specially the wheat and oats, and the vegetables. Other foods are: the oranges,  asparagus,  grapes ,  maize, the nuts, etc. 
Rivoflavina  (B2 Vitamin): 
We have,  avocado, the spinach,  coles, broccoli, asparagus or integral cereals. 

f)   Natural DYES to PRETEND the white hairs:

For Brown Hair:

Salvia (Salvia officinalis); this plants has been used from old times to disguise the first white hairs. As the preparation of this plant is applied darkens the hair that get a brown tone and covers the white hairs. Good to use when the hair begins to become white. 
Preparation: 
To mix 20 gr.. of salvia dry with 20 gr. more you. To boil the mixture in the middle liter of water distilled during 120 minutes. To strain well and to add a glass of brandy. To keep in a bottle in dark and fresh place. To make frictions day rias with the resulting liquid).

For Blond Hair:

Chamomile  (Matricaria officinalis); one of the plants more known used to clarify the hair. Chamomile provides golden tones to the people with clear hair. Also it can be used to disguise the white hairs. 
Preparation: 
To make a decoction of four spoonfuls of chamomile flowers by half liter of water. Filter and use this liquid to rinse the hair after washing it.

For Black Hair Style:

Preparation:

The black hair style with onion juice can be rinsed daily in a sauna or bath, it can help you to attenuate the white hairs, try it and will be convinced.