Typically, I brush and floss before bed. In the morning, I will rinse my mouth out to get a lot of the bacteria from overnight out of my mouth.
If I have the energy, I will brush about an hour after my morning snack and caffeine.
If I don’t have the energy, I will rinse my mouth out after breakfast.
I find rinsing my mouth out, while not as good as brushing, really helps freshen up my mouth.
I’m not sure, but I know that when a family member had to do a low FODMAP diet, they couldn’t eat things with onions in them. But onion infused oil was fine because the sugars in the onion were water soluble, but not fat soluble so the oil didn’t contain the component they were avoiding. https://www.monashfodmap.com/blog/all-about-onion-garlic-and-infused-oils-on-the-low-fodmap-diet/
Not sure it’s related but it’s the first thing I thought of.