After a fairly decent dental run, 30+ years with a couple cavities and an appliance as a kid and then a couple cavities during a six year dental hiatus, I suddenly appeared with 4 cavities which surprised my dentist and the assistants. They have come to know me for having excellent check-ups. These cavities were found around the same time I was officially diagnosed with crohn's. I told them of the diagnosis and they said that explained it and gave me a high fluoride toothpaste and encouraged me to be diligent with my oral care. They did not think the gluten intolerance was as big a factor as the crohn's.
The problem of absorbing nutrients in the gut is a big factor in dental issues, be it crohn's or celiac related. Now that I am on a whole foods diet (gluten-free and acd) I am using my energy to digest the nutrients rather than a few nutrients with a bunch of processed junk, as I did when eating before this diet. I hope to not have to have any more dental work, but who knows.