Oral B commercial-dentist a man

So I'm watching the first episode of the Mindy Project (where have I been??) at work during my lunch hour and of course there's commercials. An oral B toothbrush commercial comes on with a male dentist and a female dental hygienist. So what's wrong with showing a woman dentist? Is the female opinion just not the same as a male's? Is this where we are in society? On the Mindy Project-love the first episode and I think I'm gonna love the show. Can't wait to watch more episodes, I love hulu plus!