Because chemical processing reduces the protein content of the hair, replacing protein to build the hair can reduce damage and restore the hair.
Thin hair can benefit from protein conditioning even before the chemical perm is applied.
If you have a straight perm, deep conditioning is required about every two weeks to replace deep moisture to the hair. Moisture minimizes breakage. Sun, perspiration and heat styling all become threats to the health and strength of your hair and the condition of your scalp. These things reduce the moisture balance of chemically treated hair causing breakage, loss and discoloration, which dry the scalp. Use your fingers to lift the hair as you blow dry.