You think overall dental health was better in previous decades than it is now?
This is from a dental survey from a few years ago:
A total of 69,318 children, aged 5-15 years, were involved, from 1973-2013. Caries prevalence has reduced from 72% to 41% in 5-year-olds, and from 97% to 46% in 15-year-olds in 40 years.
Dental health as improved markedly at a population level over the past 5 decades.
Poor dental health is now concentrated in minority of families from the poorest 10% of society and has got worse since the pandemic, predominantly because this group has struggled more than most to access routine NHS dental care for their children.
What's changed since 1973 is that we now know more about the long term health damage caused by poor dental hygiene, and so there's more of an incentive for society to adopt simple, cheap strategies to address this in early life. Sadly, wagging fingers at parents isn't an effective strategy for improving children's dental health, because it's definitely the cheapest option and the most personally satisfying for people like yourself.