The strength of a hair strand depends mainly on the quality of its keratin, the protein that makes up nearly 90 per cent of its structure. When this structure is weakened by repeated damage, the hair fibre gradually loses its mechanical strength, becomes more porous and breaks more easily.
Everyday mechanical stress
Brushing too vigorously, very tight hairstyles, unsuitable hair ties, and even friction against clothing and pillows put strain on the hair shaft. Repeated day after day, these actions create tiny, invisible cracks that gradually weaken the hair.
Heat styling tools
Straighteners, curling tongs or hairdryers used at high temperatures strip away some of the moisture naturally present in the hair shaft. Over time, the hair becomes drier, less supple and more prone to breakage.
Chemical treatments
Colouring, bleaching, perms and chemical straightening profoundly alter the hair’s structure. By opening the protective scales of the cuticle, they make the hair shaft more vulnerable to external damage.
Environmental stressors
Sun, wind, pollution, sea water and even chlorine also contribute to the gradual deterioration of the hair fibre. UV rays, in particular, promote the oxidation of the proteins and lipids naturally present in the hair.
An unbalanced diet
Hair is mainly made up of protein. A diet low in protein, zinc, iron, B vitamins or certain essential fatty acids can affect the quality of new hair produced by the hair follicles.
Natural ageing
As we age, the activity of the hair follicles gradually changes. Sebum production decreases, and hair can sometimes become finer, drier and less resistant to external stresses.













