Natural oils removed during the ammonium thioglycolate relaxer procedure are replaced by a moisturizing conditioner, which helps to restore moisture and oils to the hair. Hydrogen peroxide is used only to reform disulfide bonds.
The ammonium thioglycolate relaxer procedure involves using a reducing agent to break the disulfide bonds in hair, allowing it to be reshaped. This process can strip natural oils from the hair. The natural oils that are removed during this process are typically replaced by a moisturizing conditioner. Hydrogen peroxide is used as an oxidizing agent to reform disulfide bonds in the new shape of the hair, but it is not responsible for replacing the natural oils.
Protein treatments can also strengthen the hair after a chemical process. However, a moisturizing conditioner is specifically designed to restore moisture and oils to the hair. Heat protectant sprays are used to shield hair from thermal damage and are not used to replace natural oils lost during chemical treatments.