
Hair porosity refers to your hair’s ability to absorb and retain moisture. It describes how easily water, oils, and hair products move in and out of the hair shaft. Hair porosity is influenced by the structure of the hair cuticle—the outermost layer of each strand.
Understanding hair porosity is often discussed in general hair care education because it helps explain why different hair types respond differently to moisture, humidity, and products. Hair porosity is not a medical condition and does not indicate hair health on its own.
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