Nail-biting and thumb-sucking may not be such filthy habits after all! A New Zealand study looked at the relationship between these habits and developing allergies as an adult - the results were very interesting!
Children who sucked their thumb or bit their nails were less likely to have allergies than children who kept their hands away from their mouth. The least allergic group though were the kids who did both!
Researchers say it supports the ‘hygiene hypothesis’ - where there is such a thing as being ‘too clean’ when it comes to your kids.
Stephanie Lynch, who helped conduct the research, told Washington Post that parents shouldn’t be afraid to let their kids get dirty.
After all it could be good for them!