SundayGirl - yes indeed, 'on the face of it' there is concern.
But I do not think that is the full story here. I think the dental problems are a pretext for a campaign of control and threats against the ex wife.
With the best will in the world, some people have weak enamel and no amount of healthy eating, brushing and flossing will change that.
Pammywhammy's post reminds me of something I forgot to mention about my Dsis who had to have her jaw broken at a dental appointment (an element of treatment that was not anticipated by my mum). Dsis took Ventolin from an early age for asthma and it discoloured her teeth. They developed a grey cast. Nothing could be done about this until her adult teeth grew in and eventually she had them whitened a bit.
Medicines can affect dental health and not just in cosmetic ways.
news.bbc.co.uk/2/hi/health/8112603.stm
Filling rotten baby teeth may be an unnecessary trial for children to endure, experts say.
Some 40% of five-year-olds in the UK have tooth decay and at least one in 10 of these is treated with fillings.
But anecdotal evidence from 50 dentists gathered by Manchester University researchers suggests filling baby teeth may not offer significant benefits.
Advisers to the NHS are now beginning a study on treatment options to provide dentists with clear guidelines.
Experts already know there is wide variation in care which means that a young child with signs of tooth decay could have no treatment, a filling or the tooth pulled out depending on which dentist they attend.
Without any clear guidelines, dentists currently have to rely on their experience and judgement to decide whether or not to intervene.
If the child is in severe pain and having sleepless nights, and the parent is confident that their child will cope with and benefit from the treatment, then the choice may be clear.
But when the decay is not causing symptoms, it can be difficult to decide what is in the child's best interests given that their tooth will ultimately fall out by the time they are 11 anyway.
Indeed, anecdotal evidence gathered from the case notes of 50 dentists suggests filling baby teeth may achieve nothing but expose children to the discomfort of an injection and the sound of the drill.
Fillings or extractions are really up to the individual dentist, and as the dentists have only your word to go on as to diet, with their own observations as to brushing and flossing, they really could not say credibly or categorically that in this specific case the diet of the children caused the tooth decay. They could only offer an opinion in general terms as to diet, whereas they can offer an opinion based on observation when it comes to dental hygiene, based partly on presence or absence of early gingivitis as well as other signs. Plenty of children miss spots all the time when they brush, as do plenty of adults. Tooth decay is actually the most common disease in young children.
This is not neglect. 40% of children have tooth decay. Perhaps you believe that the parents of those 40% should have their children taken from them in order to give them the best care, education, start in life etc 
www.ncbi.nlm.nih.gov/pmc/articles/PMC3698078/
FiCTION trial ongoing as of 2013 - as there is no compelling evidence of effectiveness of any of three treatment approaches to treatment of caries in pediatric dentistry - bonding/capping, filling, or extraction. What this means in practice is that the opinion of one dentist as to best treatment options will be contradicted by another
You keep on ignoring the question of whether it was you or your ex wife who took the initiative to have the bonding done.
And your theory that the children must rinse their teeth after brushing is contradicted by advice from both my own and my children's dentists as well as advice from the NHS.