Dentists say it could cause permanent damage.

INSIDER (September 16, 2020): Dentists are concerned people could permanently damage their teeth by filing down their enamel, causing tooth sensitivity and even tooth death. “It’s not the same as filing your fingernails. If you file your fingernails today, they’ll grow back tomorrow,” Dr. Chad Evans, Community Dental Partners co-founder and dentist, said. “Our teeth are permanent.”