thumb-sucking

Nail-Biters and Thumb-Suckers may Develop Fewer Allergies

Many people remember their parents pulling their thumbs out of their mouths when they were children for fear they’d be made fun of, have a speech impediment, or wind up with buck teeth. There’s even stuff you can buy to put on kids’ fingers to make them taste bitter.
Now, maybe your aversion to thumb-sucking and nail-biting stems from a fear of germs. I get it; I’m a germaphobe, too.