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95 Grammar 3 Questions (Past Simple: Active and Passive Voices) 24. Work with a partner. Ask and answer questions to find the missing information in the statements on the history of dentistry. a) Before you start, work out which questions to ask. Student A. Find the statements below. Student B. Turn to page 111. Student A 1. The earliest dental flling was made of …. 2. The frst electric toothbrush, the Broxodent, was invented in Switzerland in 1954. 3. The frst nylon bristled toothbrush with a plastic handle was invented in the USA in …. 4. In the 19 th century people believed that tooth decay was caused by worms. 5. Orthodontic brackets were invented by … in 1915. 6. Fluoride was frst added to toothpaste in 1956. 7. … was invented in 1840 by Dr. Levi Parmly, a dentist from New Orleans. 8. 100 years ago 50% of adults in North America were toothless. 9. Children in England and inAustralia dropped their frst baby tooth into a … in the belief it would keep them free from toothache. 10. Pierre Fauchard was known as the «father of operative dentistry». 11. Novocaine was widely used in dentistry in the … century. 12. The frst porcelain (фарфоровые) dentures were produced in … in 1788. 13. The Maya people used gold and precious stones to decorate their teeth. 14. Greek philosopher Aristotle believed that women had only 28 teeth. 15. … was made in the 20 th century. 16. In Europe the frst book on dentistry was published in Germany in 1530. 17. The Chinese invented … in 1498. 18. The dental scanner was introduced in 1987. b) When you have finished, compare your answers and also try to work out which of the above facts are completely untrue. (There are 4 altogether). While discussing refer to the information given in the texts above. Use the following phrases: –– I don’t believe / suppose / think that … –– I think the statement about … is false. –– As far as I know / remember …