Great, love health food store employees sometimes.
Taking OO (Olive-Oil) internally is fine, but you want it to get straight to your gums. No, it's not the most pleasant tasting stuff, and it is very strong, but you only put a drop of it in the oil you pull with.
Coconut oil is challenging because if it's not melted, then the OO (Olive-Oil) does not mix in and you may end up taking a straight-on dose of the stuff. You have to have your oil liquid in order to do the OO....
You need the pure stuff. Get it on the internet. I get mine from Mountain Rose Herbs, but there are many sources. One small bottle will last a long long time.
Do it for a couple of weeks, and then stop for awhile. Consider it like a broad-spectrum anti-biotic...which of course you wouldn't take continuously...