When there is no Dentist, you are the designated resource...
Some options are described, by a practicing dentist, in this article:
https://survivalblog.com/austere-dentistry-and-temporary-fillings-by-j-d-dmd/My recommendation is that you add some, or all, of the items discussed to your prepper kit.
You never know when these will become necessary...
Remember you cannot function at 100% when you're fighting a toothache.
[edit] The author as posted a reply to some comments about the availability and safety of the dentistry tools mentioned in the original article.
https://survivalblog.com/letter-re-austere-dentistry-2/DO read about where to find some of the cavity treatments. I see a problem with the dental profession attempting to control these particular products... It's a money thing.