Oil Swishing is taking a little bit of oil (I prefer coconut, but there is olive oil, sesame oil, etc.) and swish it in your mouth like you would swish mouth wash. The first time you do it, it will feel a little weird, but it grows on you. I do it twice a day without fail. I love it.
Why swish? To remove toxins......to remove tarter, make your mouth healthier, make your gums stronger, etc.