The difference between perm, cold perm and perm.

Perm needs to curl the hair with a heated curling iron, but cold perm is not needed. This process can be used as a popular example. We can deform an iron bar by external force, but the deformation effect is very difficult. However, this kind of iron bar is heated and melted first, and then its physical shape can be changed to a greater extent through the mold. Different physical shapes will bring different shapes to hair.

2. Different chemical processes.

Cold perm hair needs moisturizing, in order to better present curly hair effect. But perm is to change the internal and external structure of hair, so that the hair is permanently "shaped", so the curl of perm can be better maintained in both dry and wet hair. The greater the deformation of the hair, the greater the damage to the hair, so the damage of perm to the hair is greater than that of cold perm, and the perm hair should pay more attention to maintenance (including hydration).

Maintenance: Vitamin B complex and carotene can be supplemented after perming to help reduce injuries. This is because vitamin B 12 can promote smooth blood circulation, improve the utilization rate of protein and promote the growth and development of head cells. Carotene can absorb ultraviolet rays and reduce the degree of oxidative discoloration of hair. Taking vitamin B together with carotene can make hair more moist and shiny.

Extended data:

In the process of perm, the scales on the hair surface will be destroyed. Leaving the internal structure of hair unprotected will lead to the loss of internal moisture and nutrients, which is harmful to hair, scalp and hair follicles, and will denature the keratin of hair more or less, making hair easy to yellow, brittle, easy to fall off, dull and inelastic. ?

Among the most harmful perms, many perms on the market contain alkaline components, which have a certain oxidation effect. Once it touches the scalp, it is easy to destroy the small skin in the hair, leading to the loss of water in the hair.

For those with allergic skin, perm is more harmful, because the liquid medicine in perm is the most likely to produce allergic reactions. Please have an allergy test before perm to protect your hair. Avoid endangering health.