I also didn't mention, that prior to the introduction of fluoride in toothpaste, the first chemical that was added to them for dental health was sodium iodide. Sodium iodide does not push phosphate off the calcium of tooth enamel and bone. It kills the acid producing bacteria that feed off sugars that cause caries. Hydrogen peroxide also, but it's less stable. Probably sodium persulphate and similar oxidative salts might be ok but they are also unstable peroxides. The iodine, on the other hand, is at least 10x as chemically stable as the peroxides. Peroxides combined with carbonates are also good in the same role as sodium/potassium iodide. The only place you can find iodised toothpaste nowadays is Infowars Store, which the last time I checked, was out of stock. I just have some lugol's solution, and now and then I put a drop on my toothpaste to help sterilise my mouth better. Killing the bacteria, and raising the pH of your saliva are the two number one actions for improving dental health.