Shampoo without salt: myth or reality?

We've been hearing for some time that, when buying shampoos, best bet is those without salt, that would be best for the wires than those containing this substance. But is it true?
According Mariana Piovesani, marketing manager Neutrox no scientific data that refer to damage caused by ingredient - which is actually sodium chloride, a type of salt used to make foam. "The people who use the products with salt claim is that their hair feel more dry and consider a product without salt provides a hair treated and chemical processes last longer," he says.
Ie: our revenue is that you test one another and choose what is best for your hair even - with or without salt!