Dry hair, oily, or normal is influence by the oil gland inside the head skin.
Dry hair have a rougher hair pieces. This is cause by the low production of the oil gland. The hair will become more dryer as we get older. But the dryness of hair can be cause by the use of hair dryer often or stay to long under the sunlight, or use of chemical stuff such as hair paint and klorin. Dry hair look dull and stick.
Oily hair is cause by the over production of oil gland that cause by inherit factor, wrong diet, stress or hormonal. This kind of hair will stick to the head skin and look unclean.
Normal hair have enough wet.
