Read the passage  and write one suitables word for each space
Many people nowadays have to wear false teeth when they was middle-aged . Since the beginning of this century ,[1]........ decay has greatly increased . The amount[2]..........sugar in our food has also in creased  Doctors and den tist now know that [3]............  is the chief cause of tooth [4].......... Eskimos'teeth ,for example  started to [5]...........when they began to eat sweet [6]........... Long ago doctors did not like [7].............treat people's teeth.Barbers and blacksmiths [8]........ after people 's teeth and pulled them [9]...........when they decayed . Some people thought[10]............. was a punishment from the gods.