As the masses worry about artificial intelligence I suggest they worry instead about artificial digestion. When the bots start eating each other and everything else, then we worry. In this light it is good to think about our own digestion and how it starts at the dinner table.
Michael Pollan suggests, eat food, not too much, mostly plants. post 
I sometimes ask colleagues why they are vegetarian. One suggested "simple human kindness" which I took as a personal charter short of changing my diet. Another told me that when there was meat on his plate it eclipsed everything else that he wanted to enjoy. Pay attention. He is probably right. And he really enjoys a good hamburger once a year.
My vice has been snacking, even after a nice dinner. If the TV is on, I want to be eating. What's with that?
When my office started stocking the restrooms with disposable toothbrushes I tried brushing after lunch. With just a hint of toothpaste the disposables still made a big difference in my afternoon.
Clement Seeballuck and Nicola Innes, Professor of Paediatric Dentistry, University of Dundee, offer their variation of familiar advice and suggest why it is all important. post
In short, your personal biome extends into your mouth and they are not your friends. They are there for your leftovers and you are wise to leave them nothing.
My surprising discovery was that I didn't much like the after dinner taste in my mouth and that could be rectified completely with warm water and a good brush. If I miss a spot I can taste it and I brush to remove that. This reveals a mechanical skill that had been obscured by a mouth full of toothpaste until now.
I do the toothpaste thing occasionally. My city doesn't add fluoride for whatever reason so that's important too. Also I sip coffee all day so some whitening is in order. But this is something I do as an obligation to self, not because it leaves my mouth feeling clean.
I still catch myself rummaging through the kitchen looking for a snack but then I stop and ask, how does my mouth feel? If not so great, I give it a brush and feel much better as I contemplate the wonder of evolution that I am, starting with my mouth.