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✨ Why Does Hair Get Greasy So Fast? 4 Common Causes and How to Fix It ✨ If your hair loses its freshness just hours after washing or already looks oily the next day, the issue is usually not the hair itself — it’s the scalp. Fast-greasing hair is a sign that the scalp’s balance is off, and the good news is that it can be corrected. 1. Water That’s Too Hot Hot water stimulates the sebaceous glands, causing the scalp to produce more oil. As a result, the roots get greasy faster. Tip: Wash your hai