INJURIES TO THE TEETH.
Very hot or cold food, or water, sweetmeats and acids injure the teeth. Children sometimes like to show the strength of their teeth by cracking hickory-nuts and other hard substances. This should never be done, as the nuts and substances may prove stronger than the teeth. The teeth are made of a soft kind of bone, covered with enamel. The bone part of the teeth soon decays if the enamel is broken.