A new social media craze has dentists biting their nails, as teens on TikTok have taken to grinding their teeth down with nail files. Dentist Todd Bertman calls the practice “horrifying,” and warns that it does irreparable damage to your enamel. 19yearold Mia said she used a file on her teeth to avoid leaving her apartment and going to the dentist during the COVID19 pandemic. 16yearold Aislinn says she regrets filing her teeth, which are now extra sensitive to cold drinks and ice cream. #InsideEdition