What benefit does oiling my hair regularly have even after the hair strands being ultimately dead??
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It also helps the skin. Water and oils are drawn out from the skin by the hair by capillarity. Having the hair not dry will avoid that.
It also protect the hair while you are drying it with hot air
It helps the strands to retain moisture, which prevents it from getting brittle and breaking. It’s the same reason why conditioning leather helps it last longer, even though the leather itself is long dead. Moisture keeps the keratin in the hair flexible, which prevents the strands from becoming brittle and splitting or breaking.