A population’s dental health can be assessed by calculating the average number of decayed, missing or filled teeth for each person. This is known as the DMFT. The graph presents the DMFT for four countries over the period from 1980 to 1995. Australia and the USA have fluoride added to their water, whereas Japan and Belgium do not. The statements below were made. Which statements are supported by the graph?
- A1 and 2
- B1 only
- C2 and 3
- D3 only