Turns out dentists didn’t have ultrasonic scalers 400,000 years ago

By Alison Majikes/Special to thedailyfloss.com Most people visit the dentist twice each year to keep their pearly whites clean and healthy, but what happened for those who lived 400,000 years ago when dentists weren’t on call for those checkups? According to an article published on phys.org, that’s the exact question for which  Tel Aviv University set out to find out […]