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Sun

UV-rays of the sun are not only paling hair they also dehydrate. But also the scalp often looses moisture and can burn or itch. With light or scanty hair the scalp is more sensitive for sunburn.

Climate

Scalp and hair dehydrate easily in cold, heat or slight humidity. The hair becomes blunt, strawy, hard to comb and easily static. The scalp strains, itches and scales, it becomes more sensitive.

Environmental pollutants / pathogens

Air pollutants attack hair and scalp and dehydrate them. Irritations of the scalp with reddening, itchiness and burning as well as scaling can emerge.

Stress

Stress can increase the sensitivity of the scalp and inhibit hair growth.

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