Changes in the hair shaft lead to deterioration with the appearance of ruined or damaged hair.
In healthy hair, the cuticle is whole, with overlapping shingles. Hair with whole ends appears shiny, elastic and brushes easily.
Various factors may cause problems and ruin hair. We can divide damaged hair into various groups.
1) Group of coarse, porous damaged hair
In this case of brittle hair, the shingles of the cuticle are raised or in some cases absent. Hair appears coarse to the touch, dull, opaque, untameable, difficult to brush, with loss of color and a reduction of shininess.
2) Group of damaged hair with changes regarding keratin
In this type of damaged hair, the protein structure of keratin appears to be altered. The hair loses its amino acidic equilibrium, becoming gradually more delicate and less resistant to external aggressions. One of the possible causes is psycho-physical stress.
3) Group of hair damaged as a result of the hair dryer
Use of an overly intense or hot hair dryer results in dryness and dehydration of the shaft. The hair becomes electrified. It ends up losing its hydro-equilibrium, with a subsequent reduction of diameter of the shaft.
4) Group of damaged hair with split ends (trichoptilosis)
Characterized by the presence of split ends. Hair appears dry with the presence of dry, discolored and damaged ends. In the case of some lengths, it may assume a particular "dovetail" form.
5) Group of damaged hair with frayed ends (trichoclasis)
Trichoclasis, typical of fine, thin hair, causes very deep damage in the hair stem. The hair ends open up like a brush. The cause of trichoclasis is mineral deficiency.
6) Group of damaged hair with illness of the hair shaft (trichorrhexis nodosa)
Swelling of the cuticle and the cortex lead to a reduction and subsequent loss in elasticity and softness of the hair, making it untameable and difficult to brush. Off-the-shelf products with emollient and hydrating properties such as oil compresses, flaxseed and restructuring and regenerating masks are remedies and treatments used to cure brittle hair.