If you think that a group of warriors living in the late 8th to the late 11th centuries would stink to high heaven because of all the rowing and decapitating, you'd be wrong. Vikings were actually very hygienic—bathing weekly and changing their clothes frequently.

Culturally, they faced pressure to look put together that manifested through frequent wardrobe changes.

Still, one of their habits might just make your teeth hurt.

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