A century ago is probably pretty close to the worst possible time: starchy diets, relatively cheap pure/refined sugar, but no modern dentistry.
Which may have attributed/motivated the later advancements that were made.
Im not sure how this stacks against the time period youre referencing, if it was better or worse.
One of the many articles studying dental health of pre-modern populations.
Yeah, it wasn't great. Human teeth aren't really suitable for a long-lived species that eats a lot of carbs.
[1]https://pubmed.ncbi.nlm.nih.gov/19396207/
[2]https://anatomypubs.onlinelibrary.wiley.com/doi/10.1002/ar.2...
https://www.westonaprice.org/health-topics/nutrition-greats/...
Lots of pics here.
https://www.ericdavisdental.com/facial-orthotropics-for-your...
Which means they can’t afford to do anything besides watch the teeth rot out of their head when problems start showing up, leading to far worse and even more painful and expensive problems.
At the same time, we have a lot to go. "Tooth infected? Just drill it out!" which is kinda like "Hand infected? Just chop it off!"