5. Mauritius
DMFT score: 4.9
If you thought that having a DMFT score of 4.7 was terrible, then you will be absolutely appalled to learn that Mauritius has a DMFT score of 4.9. Basically, every child surveyed in Mauritius had about five bad teeth on average. That also means, that they had 23 healthy teeth, as we are only counting 28 teeth save the wisdom teeth. But, that is no consolation for having 5 bad teeth at the age of 12. Of course, adults are more responsible when considering health and hygiene, but these are permanent teeth we are talking about, and these children will basically grow up with fewer teeth than normal.