Earlier this month, Farah Khemili popped a wintergreen breath mint in her mouth and noticed a strange sensation: a bottom tooth wiggling against her tongue.

Ms. Khemili, 43, of Voorheesville, N.Y., had never lost an adult tooth. She touched the tooth to confirm it was loose, initially thinking the problem might be the mint. The next day, the tooth flew out of her mouth and into her hand. There was neither blood nor pain…

She and other survivors unnerved by Covid’s well-documented effects on the circulatory system, as well as symptoms such as swollen toes and hair loss, suspect a connection to tooth loss as well. But some dentists, citing a lack of data, are skeptical that Covid-19 alone could cause dental symptoms.

“It’s extremely rare that teeth will literally fall out of their sockets,” said Dr. David Okano, a periodontist at the University of Utah in Salt Lake City.