Straighter than Straight

After my hair was trimmed up today, to my surprise the stylist pulled out a straightening iron. Genius or complete waste of time? I get my hair cut on my lunch hour which means I'm rather pressed for time so I'm going to have to go with the latter. I asked "what's with the straightening iron?" and she said it will "make your hair straight and shiny". I replied "my hair is already pretty darn straight" to which she replied "this will make it straighter". Hmmmm....

I've never been to cosmetology school but I did take a few math courses. I know a thing or two about linear equations and I'm not sure her theory holds water. Straighter than straight? You decide...