US dentists report a big increase in cracked teeth since the pandemic. Stress triggers bruxing (teeth clenching and grinding) which cracks teeth and breaks fillings and crowns. From CNN:
For [San Francisco oral surgeon Paul] Koshgerian's office, before the pandemic, treating one cracked tooth per day or every other day was normal. These days, two visits per day for fractured teeth have been the norm; on the worst days, he might see five cases.
Derek Peek — leader of Eastern Iowa Endodontics and diplomate of the American Board of Endodontics — found that in August and September, his office had already treated twice as many cracked teeth in comparison to those respective months last year, even with fewer patients this year.