Dental Checking??

Nurses came to our school today; it's an annual visit of them to every (I suppose, lucky only) schools.
A gang of them came, in a van; but only one in charged of giving explanation and teeth brushing demo(, dental checking has been omitted).
Satria students joined late cos we need to fetch all of them to Seri Suria.
None of Satrian heard the nurse explanation; half of them managed to join in the brushing demo; half can only became audience because their toothbrush were still "on the way".
Less than half hour, the nursed gone.
Few minutes later, all Satrian arrived.
Principal blamed why we can't fetch earlier. But blames can't make any changes.
We have the giant teeth in our school as well. It's no reason to let them feel disappointed.
We take 2. Principal be our demonstrator at last, and satrian had a wonderful 'learn how to brush session' as well; without presence of a nurse!