When hair is overprocessed, your hair shaft becomes porous and dense, making it harder to style and maintain. Overprocessed hair can’t be completely fixed. Damage to your hair shaft can’t be treated, ...

Hair porosity is your hair’s ability to absorb and retain moisture. This affects how well oils and moisture pass in and out of the outermost layer of your hair, known as the cuticle. To understand the ...

‌Low porosity hair is human hair that doesn't readily absorb water and treatments. Your hair may be low porosity if it takes a long time to wet and dry. If you use hair care products, they tend to ...