I understand where you are coming from. I change my hair for interviews as well but I change my hair on a daily basis LOL. For my last job I did rock my natural curls and ended up getting the job. Before I started I texlaxed my hair because I wanted something different and then eventually went right back to rocking my curliness LOL . I believe that if you are confident in yourself and your appearance they aren't going to mind that you have a TWA, but if you want to straighten it, which is by all means your proragative(sp), I believe that SBM is good heat protectant that protects against reverting and Chi silk infusion is good.