Nail-biting and thumb-sucking bring germs into the mouth — and possibly fewer allergies,
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, too.





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There are plenty of reasons to tell kids not to bite their nails or suck their thumbs. Raw fingernail areas pick up infection, and thumbs can eventually move teeth into the wrong place. Not to mention these habits slop spit everywhere. But these bad habits might actually good for something: Kids who sucked their thumbs or chewed their nails had lower rates of allergic reactions in lab tests, a new study finds.
The results come from a group of more than 1,
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,000 children in New Zealand. When the kids were ages 5, 7, 9 and 11,
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, their parents were asked if the kids sucked their thumbs or bit their nails. At age 13,
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, the kids came into a clinic for an allergen skin prick test. That’s a procedure in which small drops of common allergens such as pet dander,
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, wool,
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, dust mites and fungus are put into a scratch on the skin to see if they elicit a reaction.
Kids whose parents said “certainly” to the question of thumb-sucking or nail-biting were less likely to react to allergens in the skin prick test, respiratory doctor Robert Hancox of the University of Otago in New Zealand and colleagues report July 11 in Pediatrics. And this benefit seemed to last,
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. The childhood thumb-suckers and nail-biters still had fewer allergic reactions at age 32,
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.

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