the reason why our hair shines

.. is because our hair is coated with a layer of sebum a natural oil being produced by sebaceous gland lying next to each hair follicule in the scalp. The sebum gives the hair each shine & protects it from losing it's own moisture content. The amount of oil secreted by the sebaceous glands will determine whether the hair is dry, greasy or normal.

Try to avoid using harsh shampoo, or dry windy weather because it can strip the natural oils from the scalp and leaving your hair dull and dry.