Common violations of the hairy scalp skin are due to excessive secretion the sebaceous glands, or, vice versa, its weakness. In such cases, hair appropriately get greasy faster or, conversely, the result is dry hair and often sensitive and allergic head skin. In addition the skin of the head and, actually, entire body, is growing rapidly, while shedding its top layer, which is quite normal and we do not notice. Naturalle occuring dead skin cell «dumping» shall not be confused with dandruff. About 45% of all people (men and women) face dandruff, most typically men aged from 16 to 30 years, and especially in the winter and spring seasons. Appearance of dandruff is contributed by irrational nutrition, stress, metabolic disorders, allergic reactions, body physiological changes, the lack or absence of good rest and sleep, changes in blood circulation, infections, injuries, nervous system breakdowns, air pollution and bad environment. And sometimes dandruff appears due to specific fungi on the surface of the head skin. And the appearance of dandruff also can happen due to the quality of water used for hair wash, bad quality or not suitable shampoos and other haircare cosmetics. In addition, sometimes fine dandruff can occur while using regular shampoo and other hair care products at some particular time due to unknown reasons. In such a case you can simply try to rinse hair and head skin after shampoo with acidified water adding some lemon juice or vinegar to it. This will normalize the scalp skin pH balance and reduce the likelihood of the dandruff formation (in alkaline scalp skin environment dandruff spreads rapidly while acidic environment reduces possible formation of dandruff). If this simple procedure does not really help, then more intensive therapeutic treatment shall be used.