What most naturally follows?

How to straighten thick hair
Wash and condition your hair.
Straightening works best when you start with clean, well-nourished hair. Wash with a gentle shampoo to avoid stripping your hair before you use heat on it and make it more prone to damage.
To ensure that your hair is properly hydrated, follow up with a straightening conditioner. They typically contain moisturizing ingredients, such as argan oil, coconut water, and macadamia oil, that help smooth your hair.