system
Given the following post, respond as if you're commenting on Reddit:
human
What causes hair to "get used to" being combed or done a certain way after awhile?
gpt
Oils will slowly accumulate and solidify on your scalp. This preserves the general position of your hair at its base, forming a kind of grain that the rest of your hair follows. If you have longer hair, you'll notice that when you wash your hair with shampoo, it falls in random directions. This is because you've freshly cleaned this layer of solidified oil off.