It is common sense that teeth alignment is very important in many countries.
Teeth is considered as very important body parts also in Japan but it is a fact that Japanese teeth alignment is not good both children and adults.
Some people do teeth-straightening but not so many like in U.S.
There are also many people who has cavity even the average number of times of brushing teeth is twice a day.
Teeth-straightening is now getting pervading among children but it is too far away to catch up with U.S.