摘要
A study shows that people have more gum diseases today than they did 2,000 years ago.The study,from London’s King’s College,is now in the British Dental Journal.Researchers looked at the teeth of 303 people who lived2,200-2,400 years ago.They were from skulls(颅骨)f ound at an old burial(葬,掩埋)
A study shows that people have more gum diseases today than they did 2,000 years ago. The study, from London＇s King＇s College, is now in the British Dental Journal. Researchers looked at the teeth of 303 people who lived 2,200-2,400 years ago.
