train on certain
teeth can thus be avoided.

[Sidenote: The Temporary Teeth]

The temporary teeth should not be allowed to be removed by decay.
Thorough dental and home care should prevent this. If cavities form,
they should be filled under proper precautions and the teeth should be
saved until the last minute, unless they are causing infection.

[Sidenote: Teeth and Infectious Diseases]

Amazingly good results from teeth-hygiene have been shown in a Boston
asylum, which cares for over 300 children. Before the introduction of a
dental clinic into this asylum, infectious diseases--diphtheria, mumps,
scarlet fever, pneumonia, measles, whooping cough, tonsillitis,
chicken-pox, croup, etc.--had been occurring for four years at the rate
of over 80 cases per year, but for three years after the dental clinic
was established the average was only 3 per year.

CHAPTER IV

ACTIVITY

Section I--Work, Play, Rest and Sleep

In order to live a hygienic life it is not only necessary, as shown in
the foregoing three chapters, to supply the body with wholesome
substances and to exclude unwholesome substances, but it is also
necessary that the body should at times act, and at other times be
inactive. There are two great forms of activity, work and play; and two
great forms of inactivity, rest and sleep. All four of these are needed
in the healthy life and in due relation to each other.

[Sidenote: The Daily Rhythm]

The whole personality should be utilized and energized in a daily
rhythm. When, as too often happens, the equilibrium and mutual
proportions of the various wholesome elements in a well-rounded life
have been lost, the balance should be restored if possible the next day.
If a physician has had his sleep broken, he should aim to make it up at
the earliest opportunity. If the afternoon exercise has had to be
omitted, an extra amount should be taken as soon as possible. Some
people find that while it is difficult to live a complete life every
single day, it is quite within their power to give every element its due
proportion in each week, taken as a whole. To go a step farther, when
the balance has not been kept even in a week as a whole, the next week
should be modified to compensate. But it is ideal to make the day, not
the week, the unit. It is almost as absurd to relegate all our exercise
to Saturday afternoon as to do all our eating on Sunday.

[Sidenote: Adjusting the Proportion of Work and Play]

It