Habits of cleanliness are easily fixed. In the most crowded, most overworked section of large cities visitors from "uptown" are surprised by the children's bright hair ribbons, clean aprons, clean faces, and smoothly combed hair. It will be easy to add clean teeth to the list of things necessary to personal and family standing. Armenian children are taught to clean their teeth after eating, even if only an apple between meals. They covet "beautiful teeth." American standards will soon prevent these Armenians from cleaning their teeth in public, but desire for beautiful teeth will stay, and will remind them to care for their teeth in private. As coarse food gives way to sugars and soft foods, stiff toothbrushes must supplement tongue and toothpicks. [Illustration: AN ARMENIAN SCHOOL GIRL] Strong as are the instinct and display motives in cleaning teeth, both parents and children need to be reached through the commerce motive. Instinct makes children afraid of the dentist, or content when the tooth stops aching. Display may be satisfied with cleaning the front teeth, as many boys comb only the front hair or as girls hide dirty scalps under pompadours and pretty ribbons. Desire to save money may give stronger reasons for not going to the dentist than instinct and comfort can urge for going. But parents can be made to see, as can children after they begin to picture themselves as wage earners, that a dentist in time saves nine, and that no regular family investment will earn more money than the price of prompt and regular dental care. A problem in arithmetic would be convincing, if, by questions such as those on page 98, we could compare the family cost of neglecting teeth with the cost of toothbrushes, bicarbonate of soda, pulverized chalk or tooth powder, early and repeated examination by a dentist, and treatment when needed. How many members in your family? What does a toothbrush cost? How many teeth have they? How many do you need in one year? How many teeth have they lost? How much does tooth powder How many false teeth have they? cost? How many teeth have been filled? How much is needed for one year? What is the total cost to date? How much would two examinations How many days have been lost a year by a dentist cost? from work because of toothache? How many teeth are now decayed? What will it cost to have them attended to?