单项选择题

According to the passage, stronchium was most useful for______.

A．strengthening teeth
B．getting a foaming effect
C．reducing sensitivity
D．gums
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单项选择题
According to the passage, it can be inferred that the Greeks and Romans ______.
A．also developed the toothbrush
B．were the first to support artificial teeth
C．had more dental problems than other cultures
D．did not keep records of their dental practices
单项选择题
What is the main subject of the passage
A．Methods of cleaning teeth.
B．Methods of caring for teeth.
C．Development of toothpaste.
D．Dental history.
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