I've been in the same dental hell.

Finally, good news re: my oral health. No work to be done last visit.

The hygenist explained that there is a 20 minute cycle for the saliva to re-enamel(?) the teeth after having sugar (which feeds the bacteria), which in turn stick to teeth, attacking tooth enamel and contribute to decay.

They sold me a type of gum called "Spry" which has Xylitol as sugar. I believe the main trick is that chewing sugar-free gum resalivates the mouth which "slicks" up our teeth and makes it hard for the bacteria to stick?? There is also mouthwash which might be easier to carry in a flash during a ride, thus enabling one to swish and spit without stopping. This brand is expensive and I'm looking into cheaper alternatives. I'm pretty sure we have dental people here who can explain it more accurately. The hygenist also warned me against having "dry mouth" while riding.

Thanks for bringing up the topic as I am looking for prevention myself.