When you go into the salon, your stylist will ... “Alkaline perms are the most damaging to your hair because our hair lives on the acid side of the pH scale,” says Gillen.

And home perm kits mean you don’t even need to spend several hours in a salon to get one ... Hair perm waving solutions are either acid or alkaline. Acid: Acid perm solutions have low pH ...

Many people leave the salon and develop red, swollen, even blistered, faces. Heat-activated acid perms, used in any salons, contain a chemical — glyceryl monothioglycolate (GMTG) — that’s ...