National Geographic : 1919 Sep
This is the Acid That Destroys Your Teeth All Statements Approved by High Dental Authorities Hidden in the Film THE acid which destroys your teeth is lac tic acid, produced from certain foods by action of bacteria. The film on your teeth-that slimy film holds the food substance while it ferments and forms acid. Then it holds the acid in contact with the teeth to cause decay. This film clings to the teeth, gets between the teeth, enters crevices and stays. The ordinary dentifrice does not dissolve it. The tooth brush fails to remove it all. So it protects the acid. Free acids are neutralized by alkaline saliva. That film is the source of nearly all tooth troubles. That is what discolors, not your teeth. It is the basis of tartar. It is a breeder of germs -millions of them. Those germs, with tartar, are the chief causes of pyorrhea. Brushing teeth does not suffice, as nearly ev erybody knows. You must remove the film. After painstaking research, dental science has found a way to do that. The way is now em bodied in a dentifrice called Pepsodent. And we offer you a 10-Day Tube to show you what it does. Use It 10 Days-Free 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 combat it. Ordinary pepsin will not do. It must be acti vated, and the usual agent is harmful to the teeth. So pepsin long seemed impossible. Now science has invented a harmless acti vating method. Five governments have already granted patents. Now active pepsin can be applied twice daily to the teeth. Authorities have made many clinical tests. Thousands of dentists have tried it. And now leading dentists all over America urge its uni versal adoption. p^ I PAT. OFF. REG. U. S The New-Day Dentifrice A Scientific Product - Sold by Druggists Everywhere (229) Send the Coupon for a 10-Day Tube Note how clean the teeth feel after using. Mark the absence of the slimy film. See how the teeth whiten as the fixed film disappears. Compare the results with the methods you now use. Judge for yourself which best protects the teeth. Do this for your sake and your children's sake. Cut out the coupon now. Ten-Day Tube Free THE PEPSODENT CO., Dept. 631, 1104 S. Wabash Ave., Chicago. Ill. Mail 10-Day Tube of Pepsodent to Nam e --. --- - - -. - - - - - - I Address ----- --- - - . - "Mention The Geographic-It identifies you"