Thanks ! To everyone who replied. I appreciate your taking the time to relate this to me.
I have a little gum recession still at the base of one tooth, plus I thought I'd see if the oil will make my teeth whiter. They're pretty white as it is, but, what the heck.
There is no downside to OP as I see it, and who knows what may be discovered.
I have a feeling castor oil is going to be my preferred one. I may blend it, we'll see.