This is probably influenced by genetics, and to a greater or lesser extent, this color loss will affect us all sooner or later. Throughout the world, the single most common reason for coloring the hair is to disguise this unwanted gray. While the chemicals used in the coloring process can affect the hair cuticle, the negatives are far out weighed by the result of looking and feeling you're youthful best. My suggestion would be, with permanent dyes, try to be diligent about coloring ONLY the root areas of the hair, as they grow out, and avoid pulling the dye solution through the rest of the hair that has been previously colored. Also, there are some great temporary or semi-permanent dye alternatives that do not alter hair cuticle as much as the permanent dyes do.
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