I guess if you could show a study showing that leaving plaque/tartar on teeth leads to better health outcomes I might be interested.
The idea that intensely cleaning your teeth (and keeping them white) is healthy is an intuitive leap that marketers take advantage of, just like the bad intuition that makes people clean their faces intensely to get rid of skin problems. The reality is more complicated. Clean, pure, healthy, white.
Fossils have better teeth than we do, but we have prettier, less fragrant teeth.
That's because those fossils had way less access to sugar, which is the main reason we need so much more dental hygiene nowadays.
https://www.dentaleconomics.com/science-tech/oral-medicine-a...
It is more probably that the sugar throws off lipid metabolic and that changes the oral microbiome.
Caries are a sign of an immune disorder or imbalance. As long as dentists only scrape peoples teeth and do not integrate their health into their practice you will keep having plaques and tartar to be remove as your body fight this battle.
https://www.lupus.org/news/people-with-lupus-exhibit-increas...
Or just terrible habits like drinking liters of soda everyday. Besides the diabetes, the mix of sugar and acid is terrible for dental health, and contrary to the myth, brushing your teeth will not save them, at all, if one persists in terrible habits.
https://www.dentaleconomics.com/science-tech/oral-medicine-a...