I have a child in my workplace clearly being neglected, and has been consistently over a period of around 2 years.
Despite our best efforts to try to engage with parents, and consistent reports being made with the relevant authorities, nothing ever changes for this child because the parents won’t engage with early help. They don’t see a problem with it.
So what I am getting at it is, if everything is as you say it is, nothing will happen beyond perhaps a welfare check.
Social services generally don’t ‘do’ anything beyond a chat unless a child is being physically harmed in my experience.
But having said that, I personally would increase the baths, seriously cut back on sugary food and make sure clothing is clean. (We all know on uniforms there will be the odd pen stain, small stubborn food stain etc but they can still look hygienically clean. But say white shirts have turned grey, and are permanently grubby looking, it’s time for new).
A dirty neck is often a place where grubbiness builds up due to skin folds and sweat etc.
Children can and do notice those who have dirty/dry food smeared faces, those who smell, and generally don’t look clean. And this does impact on friendships as they get older. It’s really sad to see as it is usually completely out of the control of the child how they arrive at school.
Everyone obviously has their own idea of what clean looks like and has their own standards. Children should have a basic level of care provided to them regardless of parents own standards. If they are happy to smell, fine, but they should not inflict that choice on their children.
Basic care should include a proper wash every single day with soap and water, whether that’s a bath, shower or very good flannel wash.
Teeth brushed twice daily.
Long hair brushed every day
to prevent matting.
Hair washed at least once a week (unless hair type determines a specific routine obviously)
Clean clothes and pyjamas every day, obviously wear them more than once if genuinely still clean and they don’t smell.
Cases like yours OP, are usually professionals just providing other professionals with their piece of a puzzle.
Not saying this is your children at all, but just for example,
Teacher notices dirty clothing, unclean body, not eating breakfast
they report that
dentist notices teeth are in a terrible state and obviously not being brushed
they report that
speech therapist notices stained teeth
they report that
Dance teacher notices unusual marks on a child’s legs
they report that
Those reports together end up in a social workers inbox and they can then go and check on the child. More often than not it’s a few minor concerns than can be addressed informally. But sometimes they could arrive to find a child is being severely abused and neglected and because those professionals noticed and reported their individual small concerns it meant that child could be rescued.