Certainly for the last 18 months my daughter has been using deodorant out of necessity.
She knows to shower every day and change her blouse every day too.
They had their 'health education' lesson the other week and from that we know some of the children are only bathing once a week
I noticed a couple of years ago, during the school play when the 'actors' mingled amongst the crowd during one scene, that some the senior pupils were in need of a good wash/deodorant/clean clothes.
The problem with them though, like everything else at this age, is getting them into the routine of doing it and them understanding WHY they need to do it - and it's not just us nagging at them like everything else.