People are sharing a trend on TikTok where they only wash their hair every few weeks. Some people believe "hair training" — or washing hair infrequently — leads to a healthier scalp and hair. But some ...

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If you want to incite some drama at a dinner party, ask people how often they wash their hair. Okay, maybe don't do that if it feels intrusive. But among the people I know I can tell you, everyone ...