A little something about coconut oil, it's not what you think.
I also prefer slathering mostly. You can also use it for oil pulling to clean your mouth. As for diet, I think it depends a lot on what else is in your diet. Here's one article response to that video. [nytimes.com]coconut-oil-good-bad-health.html
I use coconut oil to make my own toothpaste and have for many years.