Sugar Loaded Bubblegum
Blowing bubblegum bubbles was extremely popular at that point. Customarily there were even air pocket blowing rivalries. This was viewed as pretty subtle as bubblegum was not permitted in class back then, so it was consistently up to one of the valiant children to pirate some in. Obviously, with such sugar whirling around their mouths, holes were interminable, and educators and guardians began clipping down much harder on the sweet treats after every one of those difficult visits to the dental specialist.