Efficiency from a health standpoint is difficult to determine. We know, for instance, that if the water supply of a community is pure, the community is saved economic loss from typhoid; the same can be said of the milk supply and of all the precautions necessary to keep a community in health.
This is true from a dental standpoint. If we teach a large body of people mouth hygiene we cannot say how much better their health will be, or how much we have saved them through the prevention of mouth aand systemic diseases.
In the past sixteen months I have made 30,000 mouth examinations, for 17,000 Americans and 13,000 foreigners. Of this number, 96 per cent, are in need of dental service; only 4 per cent, have clean, healthy mouths; 9 per cent. are without cavities and could made healthy by a thorough cleaning; the balance have all the