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Salt bonds are also weak physical bonds, but not quite as easily broken as hydrogen. After all, hydrogen is a single atom, and salt is NaCl or sodium chloride--two atoms! These bonds are broken by changes in pH.
The pH of hair and skin is around 5. This is fairly acidic. For example, water is about 7, hair color is about 9, and household ammonia is 11. Overly acidic or alkaline substances open up the hair cuticle, allowing changes in the salt bonds present in the cortex.
This is how sea salt spray enters the hair and creates temporary extra "strength" for your hairstyle. The salt bonds reform when the pH of your hair lowers back to a nice dry 5"
So basically, using a salt water spray makes your hair curlier because it temporarily strengthens the bonds that hold together the amino acids that make up the cortex of the hair. Salt also draws moisture out of things and causes them to shrivel up.
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