I've been in a similar situation(never a cavity) and started getting some warnings from my dentist about sore gums and decay years ago, which led to some self-s

I've been in a similar situation(never a cavity) and started getting some warnings from my dentist about sore gums and decay years ago, which led to some self-studies. They have gone something like this: * Reducing the source of decay is #1, especially acidity. Swap out coffee, tea and soda for water more frequently and you get a huge boost immediately. * If #1 fails you can still aim to reduce acidity over time with e.g. having more milk or immediately brushing with toothpaste. Milk's proported function in "building healthy teeth" is probably more attributable to this rinsing property than any of the nutritional aspects. * I experimented with primarily flossing over brushing. Even though the crevices were clean, gum soreness went up overall. The opposite way around, primarily brushing with occasional flossing, the plaque can build up somewhat, but it does not result in pain. * Yes, supplementation can do something here. I went in cycles on and off Vitamin D3, and pain went up off it and down once on it again. Anyway, I have managed to quit the beverages, and occasional brushing with less occasional flossing seems to be doing the trick.