Looking back, Molly says she wishes her doctors would have retested her breast tissue when they couldn't find a tumor, and the results weren't making sense. Dr. Oz says that while many doctors are smart and hardworking, they're still human.

Since I'm on the inside, I'm telling you what it's like. Once the first couple [of doctors] that you trust come up with a diagnosis, you don't usually challenge them that frequently," he says. "Guess who's left to challenge them? It's you."

If only a few patients speak up and ask for second opinions, Dr. Oz says they may be labeled as "difficult." But if everyone takes the extra step to protect themselves, it will make a difference in the medical community.

"The purpose of this show is to make it the norm that everybody out there says: 'You know what? I'm going to make a difference. I've going to be brave. I'm going to stand forth, not just for me, but because people are going to see this story,'" he says. "They're going to become part of the smart patient army ."

Molly also wants patients—and doctors—to know that people like her matter. "I hope my doctors and everybody that was a part of [my mastectomy] are actually practicing better medicine," she says.