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Historical and popular culture references

In France, they are called dents du bonheur (lucky/happiness teeth). This expression originated in Napoleon 's time: when the Napoleonic army recruited, it was imperative that soldiers had incisors in perfect condition because they had to open the paper cartridges (containing gunpowder) with their teeth when loading their muskets. All those who had teeth apart were then classified as unfit to fight. Some men broke their own teeth to avoid going to war.