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Curd is basically milk that has curdled because of the addition of an acid. Usually this acid is lemon juice, vinegar or by the addition of bacteria and yeast. You can consider that these then exist with a large amount of the chemical make up of milk. Milk is beneficial for you whether you ingest it the regular way by oral consumption or even by skin application. However, the same does not apply to the hair as the basic composition of hair is different to the skin.
Milk has been used as a cosmetic for years. There is some solid logic behind this practice as was discovered by scientists over the years. Milk has a crucial ingredient in it called lactic acid. This acid has the power of dissolving some the proteins that hold together dead skin cells. A good scrub afterwards would then reveal a new layer of skin. In net effect, it is an exfoliating agent. However, it is not a very cost effective or prudent way to exfoliate and some of the more modern treatments for exfoliating can have the exact same effect. In fact some home remedies like citric acid from lemons do the exact same thing. Hair on the other hand is not at all affected by the effect of these acids because of the tough structure of their mail element keratin. This is a protein that is very tough and robust and can take a lot punishment from acids. In fact some acids as those found in hair conditioners actually strengthen the hair. However, prolonged acid attack will make the hair lose its luster. Now bear in mind that curds have an amount of acid in their make up which is not lactic but citric. These will have no benefits to your hair at all. Therefore, considering that there is no definitive last word on whether using curds in your hair is good for you, scientifically, it would not be a good idea to apply this to your hair.
You are probably better off using a conditioner that rebuilds your hair or gives it a shine like effect. This of course depends on what you are looking to achieve. There are conditioners that can help you with all types of needs. You could also avail of thermal conditioners that help protect the hair from the heat of curlers and irons.
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