Or for a completely different view of what's to blame for poor oral and dental health, Google the following
Oral Disbiosis and tooth decay
Whole grains cause tooth decay
Vitamin d deficiency and dental carries
Clearly, something is very wrong with people's diets if their teeth and bones are falling to bits (teeth you can see, bones you can't of course!).
There is evidence to suggest that dysbiosis in the gut and oral cavity gives rise to bacteria that are particularly damaging to teeth (without those particular bacteria, dental decay won't happen even if your dental hygiene is awful).
There is evidence to suggest that gut dysbiosis is caused by our very carbohydrate heavy modern diet (especially by the grains that make up a large % of that carbohydrate intake), maybe in conjunction with overuse of antibiotics.
There is evidence to suggest that whole grains, being full of phytic acid and lectins, are actually worse than white flours from the pov that they block the absorption of minerals needed for bone and teeth building, and use up vitamin D stores.
And grains displace more nutritious foods from the diet, which again is contributing to vitamin and mineral deficiencies.
I think there is a lot more going on than parents being neglectful!
I have said my tuppence worth, it's just a starting point for people to read up some alternative explanations about diet and tooth/bone health... I'm not getting into a debate about it (or saying your kids should eat a ton of sugar and never brush their teeth!). I just think the causes are a lot more complex than what is being suggested.