system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How did shampoo become popular if there aren't any benefits to using it?

I can see why once people start using it they don't want to stop due to greasy hair, but why did it start if its not useful? Also, if there are benefits that I don't know about, what are they?
gpt
There are a lot of benefits to using shampoo, you simply are not suppose to use it more than once or twice a week. Shampoo cleans your hair removing both dirt and natural oils. This is a good thing if not done too much.