Noting [2fries] idea about alternating pools of water that reduce algal growth [link]:



Two phase dental hygiene:it seems plausible that a harmless antibacterial at a mouth rinse might cyclically complement a harmlessly antibacterial toothpaste. I have heard cheese prevents tooth decay so perhaps an emulsified oil or cheese protein at the
toothpaste and some less yucky tasting ingredient from listerine could complement each other cyclically.



Then again, perhaps there is zero correlation between the number of bacteria in a mouth, the recovery time of S. mutans tooth plaque, and actual cavities. It might be a novel, potentially effective breath freshener though. P. gingivitis could be another
bacteria to measure.



Another possibility is a morning mouth rinse and an evening toothpaste, each with very different ways of terminating plaque and breath scent bacteria. That way morning breakfast tastes OK rather than toothpastish.



If cycling pH can be used to reduce bacteria quantity and growth then a polyprotic fruit acid like food grade adipic acid (low pH) could be at the toothpaste and possibly a flavor-tolerable high pH magnesium containing molecule could be at the mouth
rinse. Magnesium threonate tastes neutral or slightly pleasant and is even published as a nootropic.



If it is possible to demonstrate that a toothpaste/rinse cycle reduces cavities and unpleasant breath as effectively as brushing twice a day (Which I do not do) then this could take the place of some toothbrushing. The flavor of breakfast could be
improved for millions of people! Minty breakfast cereal and surfactant flavor disruption would be a quaint 2019 experience.



Also, there is that fruit that makes everything taste sweet, but takes 1/2 an hour to work. If you put that at the AM mouth rinse then it might have time to work, causing breakfast to be really sweet tasting.

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