At first glance, the hair dye and treatment of head lice do not seem to have nothing to do. However, there is evidence that this combination works.

Many people suffering from lice said their problem improved or even disappeared after undergoing a session of tincture in a beauty salon. So how dyes act on the lice? Before synthetic dyes exist, to change or enhance your hair color often used natural pigments of plants, flowers and tree bark. Traditionally, henna was used to darken hair and chamomile to lighten it. But these pigments tend to disappear within a few days, which resulted in the need for additives for coloring longer adhere to the hair. It was there appeared the coal tar dyes for semi-permanent dyes and PPD for permanent.

But for those ingredients were effective previously had to apply a component to prepare the hair. Then they began to use chemicals for color correction. Using chemicals such as ammonia and hydrogen peróxiodo, opened the stem capillaries. The dyes containing those ingredients were called oxidation dyes. With these chemicals are able to clarify the hair in a shorter period of time. Those chemicals are attributed the effectiveness of the dyes and the remedies for lice. The coat has a protein called keratin and work with it substances to show hair. When you open the stems capillaries, altered the glue that binds the nits to the hair, resulting in its detachment.

Another ingredient in hair dyes that may work against lice is alcohol. But it has a side effect: dry hair because the hair shaft loses moisture.

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