Experts agree that there are three main types of hair: straight hair, wavy hair, and curly hair. Understanding your hair type is essential for taking care of it and keeping it healthy and strong.
Straight hair has a flat and smooth structure. It is usually very easy to manage and requires less time. However, it tends to become greasier compared to other hair types.
Wavy hair has natural waves. It can range from slightly wavy to very curly and can be a bit more difficult to style compared to straight hair. However, with the right hair products and proper care, wavy hair can appear soft and shiny.
Curly hair forms natural curls or spirals. They are often very thick and may require more time and products to be styled. However, if taken care of properly, curly hair can be incredibly beautiful and seductive.
In conclusion, it is important to know your hair type in order to take care of it. Once you have identified your hair type, you can choose the most suitable products and adopt a personalized care routine. With the right products and proper care, every hair type can be beautiful and healthy.
Molecular Basis of Hair Fiber Curvature
The curvature angle of the hair fiber is determined by the asymmetric distribution of disulfide bonds (S–S) within the cortex. Straight hair shows a symmetric distribution of cysteine-cysteine linkages between the ortho- and paracortical macrofibrils, producing a fiber that grows in a linear trajectory. In curly hair, the asymmetric distribution — more S–S bonds on one side of the cortex — creates a differential tension that curves the fiber during keratinization. Follicle morphology also plays a role: a comma-shaped (asymmetric) follicle produces high-curvature hair, while a cylindrical follicle produces straight hair. These structural differences are genetically determined and modifiable only through chemical treatments (perming, relaxing) that act on the S–S bonds.
Professional Formulation Implications
Each curvature type implies specific formulation requirements. Straight hair (type I) has a uniform sebum film but tends to weigh down easily — lightweight formulations based on volatile silicones or diluted film-forming polymers. Wavy hair (type II) requires a balance between hydration and definition — light oil-in-water emulsions with polyquaterniums. Curly hair (types III–IV) has a structural sebum deficit due to the curvature that impedes sebum migration along the fiber — rich formulations with fatty alcohols (cetearyl), butters (shea, mango) and humectants (glycerin, hyaluronic acid).
Professional Product Adapted to Hair Types
The Curly Up Mask 250 by Edelstein, available on cliCHair.ch, is formulated specifically for high-curvature hair (types III and IV): its rich matrix of shea butter, fatty alcohols (cetearyl alcohol) and glycerin provides deep hydration adapted to the spiral fiber architecture. It compensates for the natural sebum deficit characteristic of very curly hair, whose curvature prevents uniform sebum distribution along the hair shaft.