www.statista.com/statistics/547781/frequency-individuals-brush-their-teeth-united-kingdom-uk/
Slightly more reassuring stats on adults and dental care.
So worrying about children though. Not attending the dentist used to be used as a signifier of neglect in the same way as not using other forms of healthcare, but social workers had to stop using teeth as a signifier due to dental deserts, and also our highly starchy and sugary diet so that parents who were otherwise not neglectful had children having baby teeth removed or couldn't find a dentist.
Of course not attending a dentist also means that teeth can't be treated early on, dental neglect can't be caught early and parents/carers and/or children educated about dental hygiene, and that's the problem, is that when people fall through the holes in our society now nobody discovers the issues. I imagine a lot of the kids with heavily neglected teeth will never get treated, lose them and it won't be caught until later on once they have adult teeth (because of the more dangerous root infections on adult teeth). They will also not be flagged as being neglected even when the dentist does see them.
The problem with using school attendance and lateness is that it is a blunt instrument, which treats kids with health problems, mental health conditions and neurodivergence who are struggling with attendance the same way it does with kids who are being neglected or abused, and a lot of the time these kids are missed when their attendance is good, which it often is because the parent prioritises time away from their child, or because they cling to school like a life raft as the one place where they will be fed and cared for.
If we had a properly functioning universal NHS dental system it would be easy to find out who was neglecting their kids dental hygiene, through their non attendance, or through their attendance at the dental practice and early intervention (which if followed would not be a safeguarding issue, and if it wasn't would). Which is the same as we have with healthcare, where if you don't take your child to get a broken bone looked at you get flagged to safeguarding, and if you do get your child's broken bone looked at they can see on an x Ray any concerning injuries, and start to form a record if their are repeated injuries. We need just as robust a response to dental health. Otherwise we will continue to see children having unnecessary extractions, families not supported when they do need help to make the necessary changes, and social services not intervening if they are unable to make those changes.
Instead we have the arbitrary attendance system, and very little else. And I'm not against the attendance system completely, I think it's good that children's absence is noticed and that schools can work with families regarding any underlying issues, I just wish it wasn't used as a blunt instrument, without nuance and without anything else in place for the children who have good attendance, but none the less are being neglected and abused.
If that means bringing back the nit nurse and the school nurse doing dental and other hygiene examinations, that would be great if it catches those poor kids who slip through the cracks. But personally I would rather see provision of universal NHS dentistry, that is properly funded so as to not make NHS dental contracts prohibitively expensive, but instead incentivises dentists to treat the most vulnerable people in our society with the same care as the richest