Abstract
The states of the hair and the scalp change greatly with their age, sex, life style and favorite hairstyles. Since the hair is dead tissue, it does not have feeling, and as compared with other parts of the body, feeling of the scalp is blunt. Furthermore, it is difficult to watch the hair and the scalp by themselves. Therefore, it is hard to notice the change (aggravation) of the state. The mild washing technologies for the hair and the scalp which are different in character from other body parts are explained.
