The results fit with other examples of the benefits of germs,
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. Babies whose parents cleaned dirty pacifiersby popping them into their own mouths&nbsp,
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;were more protected against allergies,
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. And urban babies exposed to roaches, mice and cats had fewer allergies,
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, too. These scenarios all get more germs in and on kids’ bodies. And that may be a good thing. An idea called the hygiene hypothesis holds that exposure to germs early in life can train the immune system to behave itself,
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, preventing overreactions that may lead to allergies and asthma.
It might be the case that germy mouths bring benefits, but only when kids are young. Hancox and his colleagues don’t know when the kids in their study first started sucking thumbs or biting nails, but having spent time around little babies,
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, I’m guessing it was pretty early.
So does this result mean that parents shouldn’t discourage — or even encourage — these habits? Hancox demurs. “We don’t have enough evidence to suggest that parents change what they do,” he says. Still,
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, the results may offer some psychological soothing, he says. “Perhaps if children have habits that are difficult to break,
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, there is some consolation for parents that there might be a reduced risk of developing allergy.”

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