"Er..." And there stood the question, didn't it. There really wasn't much of a reason, beyond social conditioning and wanting to look good; it was just something you did.

Tentatively, and a bit uncertainly, he ventured, "Nothing particularly bad, it's just... something to avoid...? It's not like the hair itself is actually alive, except at the roots..."

Staring thoughtfully at the top of ZEX's head, he continued absentmindedly working the conditioner through his hair, automatically worrying at any snags or snarls his fingers came across.