Washing your hair too soon will shorten the life of your keratin treatment. If you can wait a week before getting your hair wet, even better! Try using a dry shampoo if the lack of lathering your locks is bothering you. Avoid using any ponytail holders such as elastics or even hair clips, if possible. Try a fabric bandanna if you want to keep your hair out of your face. Using hair ties or clips may cause a crease in your hair. However, this may not be the case if you wear a hair tie loosely. Your keratin treatment may last longer if you avoid styling or drying your hair with heat. Wash your hair sparingly as needed with shampoo only (skip conditioner). Use a sulfate-free shampoo.

Summary:
Don't wash your hair for at least three days. Don't use hair ties for at least 48 hours. Avoid heat and certain hair products.