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Why does dry hair look dull?

Our experts answer your most frequently asked questions.

Hair generally appears dull due to the deterioration of the scales of the cuticle. This prevents the hair from reflecting the light.
Among the primary external causes of this are diets that are too low in fatty acids (olive oil and fish), and excessive or poorly adapted use of hair care products.
Exposure to the sun and hard water (during washing) are also factors which may result in dull-looking hair.