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This would have been in the late 80s / early 90s, small town USA. In grade school they played a live action educational movie that was set in a town in the Wild West (I think the kid protagonists may have got there through time travel from a playground somehow) about dental hygiene. The kids ran into a local bandit / obvious bad guy type, who grew increasingly agitated as they explained to him how plaque disclosing tablets show where you haven't brushed. He finally lost his temper and yelled "That does it! This town is miiiine!" At that point the projector broke and we never found out what happened next. I can't find any trace of it online!