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Eating nitrate rich vegetables like lettuce and spinach could hold the key to better oral health. BSIP/Universal Images Group via Getty Images

Eating leafy greens could be better for oral health than using mouthwash

Want to improve oral health? Channel your inner Popeye and eat plenty of leafy greens – a nitrate rich diet could help prevent dental issues before they begin.
Need a handkerchief? Num LP Photo/Shutterstock

Why do onions make you cry?

Like many plants, onions have defenses to ward off creatures that may want to eat them. Their secret weapon is a kind of natural tear gas.

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