The curly hair
There’s a big difference from one hair to another: it can be plentiful or sparse, thick or thin, light or dark... and of course it can be curly or straight. A protein called alpha-keratin is responsible for curly hair, which contains hydrogen and sulfur. Two sulfur atoms join together to form a similar bridge. If these bridges are stacked in parallel, the hair is smooth; and if the bridges are diagonally arranged, the hair is curly.
Moisture also curls the hair; in fact, the hydrogen of water forms other bridges with the hair, causing the formation of pests. But there’s a curiosity: once the hair is completely wet, it softens: as there are more molecules of water, they form bridges between them; the hair is joined in groups (slices of hair) and, being more hydrated, it is more elastic and easier to comb.
Therefore, to curl, it is necessary to humidify the hair and use products that form bridges. If it is desired to soften the hair, however, it is advisable to work it in the heat, since the bonds created by the humidity are broken by a good drying.
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