Is it something to do with our age that these young things think it's fine to give us patronising lectures?! They could just suggest to us, like normal people, of the latest helpful ideas ......
My teeth hygiene routine developed over years of suggestions is as follows. Brush teeth before breakfast, 2 minutes, or more, without brushing too hard, with electric toothbrush. Forget using a circling motion on each tooth ......! Any sugars eaten at breakfast are already eroding the dentine and brushing after increases the erosion. So I use the interdental brushes, in the bathroom, after breakfast to remove the remains, and just rinse off the interdental brushes. I then use a plastic tongue scraper ever since I suffered a mouth infection - not nice.
Before bed I use dental tape before brushing my teeth. The interdental brushes don't slide through the top ends of the adjoining teeth, whereas the tape does. And finish with a tongue scrape.
Weekly I soak the toothbrushes, interdental brushes and tongue scraper in a weak solution of hydrogen peroxide (obtainable at pharmacies), and all sorts of bits float away as the peroxide fizzes. Some time ago we are told that we should not use toothbrushes for more than 3 months in case of some bacterial infection that could infect the heart. Just in case my toothbrush lasts more than three months, as well as the rest of the bits and pieces, I hope the relevant bacteria are killed off in the peroxide solution.
Mouthwash has been recommended, but they set my mouth afire, except one flavourless one (can't remember its name)which costs a ridiculous amount, so not used except when infection/gum disease threaten. Hydrogen peroxide can be used as a mouthwash, but even a weak solution sets my mouth zinging too much.
Despite lack of mouthwash, no false teeth and my dentist gives a very occasional brief scrape of accumulated tartar - that is what flossing and interdental brushes have achieved, through efficient mouth hygiene. And nowadays we are all persuaded to have bridges and implants, not available on the NHS, instead of false teeth which presumably still are, at less cost.