The Journal

The Tressana Journal.

Science-backed hair care, texture intelligence, and the future of inclusive beauty — written for every type.

Understanding hair types from 1A to 4C Hair Science
March 5, 2026

Understanding Your Hair Type: The Complete Guide from 1A to 4C

Hair typing is more than a letter and number. Learn the science behind the classification system, why porosity matters just as much as curl pattern, and how to identify your unique hair profile for better care decisions.

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Why hair care AI needs diversity Technology
Coming Soon

Why Hair Care AI Needs Diverse Training Data

Most beauty AI was trained on limited textures. Here's why that's a problem and how Tressana is building differently.

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Ingredients to avoid for textured hair Ingredients
Coming Soon

5 Ingredients to Avoid If You Have Textured Hair

Not all "natural" products are safe for coily and kinky textures. We break down the ingredients that silently damage Type 3 and 4 hair.

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