The teeth are brittle, and are often broken in this way.

The use of candy and too much sweet food is also likely to injure the teeth.
~13.~ Some people think that it is not necessary to take care of the first set of teeth.

This is a great mistake.

If the first set are lost or are unhealthy, the second set will not be as perfect as they should be.

It is plain that we should not neglect our teeth at any time of life.
~14.