A simpler alternative is xylitol. Not a drug, no FDA approval required. It's a plant-based sweetener that cavity-causing mouth bacteria love to ingest, but which provides no sustenance to them. It essentially fills them up and then causes them to starve them to death, helping maintain minimum mouth bacteria. No bacteria, no cavities. Get it in mints or gum like Zellies or PUR (the only two I've found that don't inclu…
The product I've been using is this: https://carifree.com/product/maintenance-rinse/
Also it's alkaline in ph, unlike many mouthwashes on the market. Caries need an acidic environment to do their thing, so you want your mouth to be inhospitable to them. Acidic mouthwashes may kill off the bacteria, but they make it a nice environment for any that remain to attach your teeth.