National Geographic : 1918 Dec
How Scientists Clean Their Teeth All Statements Approved by High Dental Authorities The facts stated here have been widely known for some years among dentists and scientific men. But they were not presented to the public until proved beyond dispute. People who know - by the hundreds of thousands -are changing their teeth-cleaning methods. And these are the reasons: The old methods proved inadequate. The best-brushed teeth too often discolored and de cayed. Despite the wide use of the tooth brush, statistics show that tooth troubles have constantly increased. Science found the reason in a slimy film. You can feel it with your tongue. It is constantly forming, and it clings. It gets into crevices, hardens and stays. REG. U .. . That film is the cause The New-Da of most tooth troubles, and the old methods A Scientific Product - Sold could not end it. That film-coat absorbs stains, and the teeth seem discolored. It hardens into tartar. It holds food substance which ferments and forms acid. It holds the acid in contact with the teeth to cause decay. Millions of germs breed in it. They, with tartar, are the chief cause of pyorrhea. Also of many other serious diseases. It is therefore best to brush the teeth in ways which can end the film. Four years ago a way was found to combat that film efficiently. It has now been proved by thousands of tests. Today it is embodied in a dentifrice called Pepsodent, and we ask you to test it yourself. Return your empty tooth paste tubes to the nearest Red Cross Station (153A) 11111111111111111111ii1111111111111111111111111111111111111111 Make This 4One-Week Test Pepsodent is based on pepsin, the digestant of albumin. The film is albuminous matter. The object of Pepsodent is to dissolve it; then to constantly prevent its accumulation. This is not as simple as it seems. Pepsin must be activated, and the usual method is an acid, harmful to the teeth. So pepsin long seemed barred. It is now made possible, be cause science found a harmless activating method. Five governments have already granted patents. That method is employed in Pepsodent. PATOFF Many teeth-cleaning e j I methods, widely pro claimed, have later been found inefficient. So y Dentifrice Pepsodent was submit ted to repeated clinical Sby Druggists Everywhere tests, under able author ities, before this an nouncement. Today it is proved beyond ques tion. And the object now is to bring it quickly into universal use. Our method is to offer all a free tube for test. Send the coupon for a one-week tube. Use it like any tooth paste, and watch results. Note how clean the teeth feel after using. Mark the absence of the film. See how teeth whiten-how they glisten-as the fixed film disappears. Let Pepsodent thus prove itself. See its unique results, know the reason for them. After that you will not be content to return to old methods of teeth-cleaning. Cut out the coupon now. - ONE-WEEK TUBE FREE THE PEPSODENT CO., I Dept. 373, 1104 S. Wabash Ave., Chicago, ll. SMail One-Week Tube of Pepsodent to Name ... I Address _....----------------------------- "Mention the Geographic-It identifies you."