So, you left your last dentist appointment promising (once again) that you’d floss everyday and never forget to brush before bedtime. If you feel you’ve kept good on your promise, but still want a little insurance, help may soon be on its way—in the form of coconut oil. That’s right, according to a September 2012 study from the Athlone Institute of Technology in Ireland, enzyme-treated coconut oil may help protect against tooth decay. After testing the treated oil against strains of Streptococcus bacteria (the kind of bacteria that causes tooth decay), they found that it actually stopped the growth.