Mas said she did notice a whiter smile.

"One of my girlfriends asked what have I done I said 'I am doing the sunflower oil.' She said, 'Seriously they look whiter than they were,'" Mas said. "It's very simple and very cheap a lot cheaper than buying teeth bleach and all the gum things and just in the two weeks I have seen a huge difference."

While the women in this test swished for 15 minutes, for the best results, CJ recommends swishing 45 minutes to an hour. But you definitely don't want to swallow the oil as it could upset your stomach.  Also, when you spit it out, don't use your sink. The oil could clog your pipes, so use a trash can.