How to remove a loose tooth is a question that's plagued man since the beginning of time. Do you let it fall out naturally? Break out tweezers? Stuff your mouth with gum? Tie a string to a door knob?

When Emma Conkey was ready for her very first loose tooth to fall out, she let her little brother try and pull it out. It didn’t work, though, because 5-year-old Emma “couldn’t quit laughing,” her mom ...