The sugary foods advice is true if you're talking about refined sugars, but I recall a study showing that raisins, e.g., are much better than refined flour in terms of damage to teeth. Despite having much higher sugar content.

Here's an article about the study: https://nutritionfacts.org/blog/raisins-and-dental-health/

You know what flour turns into very, very quickly in you digestive system?

Sugar.

The comment was about teeth, though, and flour/meal is abrasive, though. Not to the degree it was in prehistoric times--dental health went to hell during the transition to sedentarism, thought mostly to be due to milling introducing rocks etc. to the meal--but, setting aside that both are nutritionally probably not great, it stands to reason that the stuff mentioned in that blog post (mostly grain-derived) have more ways to stick to the surface of teeth and hang around to mess up mouth pH.

> floss weekly

For me daily makes a big difference. If I leave it until weekly my gums will start to suffer for it.

I use the little floss picks, as they're much easier to manage for me than floss, and - here's something - they're reusable. Rinse them off like you would your toothbrush and you can keep those suckers going for a long time. You can also get them made from bio-plastic, so that they'll degrade once they go to landfill.

Do you get those ones that are thinner than normal floss? Because it won't be as effective if so. Tried the Listerine ones but I'm curious which brand you get that has bioplastic

This is not the brand, but they look a lot like this. https://www.amazon.com/Natural-Dental-Floss-Picks-200/dp/B08...

The double string ones are really good, as they catch a lot of gunk in the gap between them.

Surely floss daily should be the advice? It only takes an extra minute when you are brushing so there’s no reason not to.

For the same reason you don’t brush 10 times a day. It isn’t significantly more effective than once a week and we all have better things to do.

Was wondering if you knew any RCTs or solid studies...

Dentistry in general seems averse to doing RCTs.