The use of tear gas is an accepted and proven method of crowd control, though certainly not the only one and not always the best.

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My partners and I cofounded VitalSmarts, an innovator in corporate training and organizational performance which has helped more than 300 of the Fortune 500 realize significant results using a proven method for driving rapid, sustainable, and measurable change in behaviors.

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The report says scientific evidence suggests "almost every proven method to prevent decay includes delivery of fluoride to teeth surfaces".

BBC: Tooth decay in children too high, says chief dental officer