PURPOSE: To easily and surely perform the effective removal of dandruff without spending cost by washing hair so as to almost completely wash away the dirt stuck on the skin of the head.

CONSTITUTION: The reason why the dandruff is increased after a shampoo is that the shampoo is not enough and the dirt remains after the shampoo. Therefore, the shampoo is executed according to the estimation that no dandruff is generated when the dirt is completely wahsed away by the shampoo. Namely, the shampoo is executed by using any normal shampoo but in this case, it is preferable to use normal toilet soap or soapy shampoo. Then, the number of times of shampoos to be performed at the same time by using the normal toilet soap as the shampoo is more than 10 times for a person who does not almost generate the dandruff and over 20 times for a person who frequently generate the dandruff.