Move over, Santa. Now there’s another magical character for kids to track: the tooth fairy. After making a personalized tooth fairy video for his nephew, Oliver Finel noticed a gap. While there are ...

For 20 years, Dr. Purva Merchant has been answering letters from gaptoothed children and their parents — roughly 6,000 in all. “Happy growing up,” she typically replies. Credit...Su Yun Song Supported ...