Japan's "bagel heads" have apparently been around for years, but the trend is only now getting attention in the West thanks to a segment on Taboo, a National Geographic program.
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A "bagel head" is created by injecting saline into a forehead, then pushing down on the center of the resulting bump. The look lasts between 16 and 24 hours.
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Here, the saline bumps before they become bagels:
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And after:
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Yum.