[manmal]

Xylitol does selectively inhibit some bad strains, and some oral probiotics (K2 BLIS, L. Sakei, B. Subtilis) are quite aggressive in killing off other species.

Might also be worth looking into all the substrates required for bone and connective tissue building, apart from the obvious (calcium, magnesium), e.g. silica, iron and copper.

[speedylight]

Do you think the Xylitol in gum is good enough for that?

[manmal]

Probably yes? Avoid fructose for a while before and after because that allows bacteria to avoid xylitol uptake.