L&B - do you just put the oil straight on your toothbrush, or dilute it a bit with water first?

In each of my pregnancies I have found a particular toothpaste that I seem to sort of crave. It's so weird. It's the Macleans Extreme Clean. It doesn't taste like the normal minty sorts of toothpastes. I never found that brushing my teeth made my morning sickness worse until this pregnancy. It doesn't worsen the morning sickness as such, but it has made me gag and dry retch a few times.
Thanks. I'll give that one a go.