Perm is a kind of hairdressing method, which can be divided into physical perm and chemical perm. Nowadays, chemical perm is the most commonly used. There are actually two purposes of perm: to make hair richer (with curling effect); Change the shape and direction of hair (curling is not very effective).
The basic process of perm is divided into two steps. The first step is to break the sulfur bond and hydrogen bond in hair through chemical reaction. Step 2, arrange the stable hair core structure.
Extended data:
The historical changes and evolution of hair styles reflect the politics, economy and culture of human society and the image level of a nation from one side. Therefore, in the history of human development, hairstyle always reflects the replacement and development, progress and prosperity of society.
Perm is divided into cold perm and perm. Cold perm is suitable for boys with short hair, and perm is mainly suitable for girls with long hair.
Whether perm or cold perm (cold perm is a general term including tin foil perm, cigarette perm, corn perm, pickup road, perm and so on. ), the true meaning of perm is the same.
That is to destroy the structure of hair first, then make it into a certain shape and then fix it. I think most people have a perm. First, they wash their hair, then apply the first dose of medicine to their hair, heat it, wash it off, fix it into a certain shape with some tools, and then apply the second dose of medicine to wash their hair.