Style / Subject
What actually changes hair condition, and what labels do not tell you.
The lead / classic editorial essay
The American Academy of Dermatology does not give one number. It gives a rule: wash when the scalp is dirty or oily, which might be daily for straight oily hair and every few weeks for dry, curly, or thick hair. Shampoo the scalp, not the lengths.
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The argumentHair-wash frequency is a scalp-oil and hair-type problem, not a moral calendar. The American Academy of Dermatology tells people to wash based on how often hair gets dirty or oily: daily can make sense for straight hair with an oily scalp, while dry, textured, curly, or thick hair may only need shampoo every two to three weeks as needed. Shampoo belongs on the scalp. Lengths need less detergent. Flakes can mean you are not washing enough, not only that you are washing too much.
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