If you have straight hair you have Type 1 hair ... which are “single strand knots that happen when the hair strand creates a knot within itself,” says Johnson. Also known as textured ...

There are four main hair types: straight, wavy, curly and coily ... Hair texture typically refers to how thick each individual strand is. Texture is categorized into three types: fine, medium ...

To address these limitations, the research team designed a small monitoring device that looks like a strand of hair and is made from 3D-printed hydrogel material. One end is the electrode.

To test your hair's porosity, place a strand in a bowl filled with water ... and individual needs. Fine, thin, straight hair is typically more prone to being oily, requiring more frequent washing ...