Harvard Health Blog

Fewer allergies: A possible upside of thumb sucking and nail biting

By: Claire McCarthy, M.D., Faculty Editor, Harvard Health Publications As a pediatrician, I get a lot of questions about thumb sucking and nail biting. Both worry parents a lot: they worry about damage to teeth, about infections, and about teasing from other children. Now a study published in the journal Pediatrics, the official journal of the American Academy of Pediatrics, says that there may actually be benefits to having your fingers in your…

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