If, like me, you have a problem with dandruff, you doubtlessly use an anti-dandruff shampoo (as against standing in a wind tunnel and having all the flakes blown off).
That being the case, you will notice that after a while, the shampoo seems to become ineffective and the flakes and itchy scalp return.
My theory is that over time one's scalp becomes immune to the properties of a particular brand of shampoo. If you change to another brand, this problem is solved. However, one needs to change brand every few months.
Seems to work for me, but is there a scientific basis for this, I wonder?
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