When should you cease using the eyes? What should be done if a cinder gets under the lid? What should be done if that fails? When must spectacles be used, or an oculist consulted? How must the feet be kept? Which are the better, cotton or woolen stockings? What of tight shoes? What should be done with the nails? CHAPTER VI. THE TEETH. Few boys and girls take proper care of their teeth. All of us admire a set of strong, sound, even, white teeth, and those who do not have such, will tell how sorry they are because in youth they were so careless that their teeth were ruined. The teeth should be carefully cleaned each morning before breakfast. This is best done with a good brush, Castile soap, and lukewarm water. Use none of the numerous tooth-powders sold, and never pick your teeth with a metallic substance. Quill, wooden, or ivory tooth-picks only should be employed. When the brush does not remove the stains from the teeth, the soft end of a small stick, covered with powdered charcoal will answer, though it should not be used often. 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. TWO SETS OF TEETH. The first set of teeth, twenty in number, gradually become loose after a child is five or six years old, and the second set, thirty-two in number, crowds after them. The second are the teeth which are meant to last all our life-time, and they should be guarded, therefore, with the utmost care. Sometimes the second teeth crowd so closely that the first become wedged in place. The old tooth should be removed, just as soon as the second can be discovered pushing after it. If this is not done, the mouth will be filled with crooked and unsightly teeth. [Illustration: THE PRINCIPAL TEETH.] The mother or father of any boy or girl will readily draw a loose tooth, by means of a looped thread. Often, however, a brave child will pull his own teeth, without help. Be on the watch and clear the way for the second teeth. If you don't you will be sorry all your life. Some children have poorer teeth than others, and the utmost care will not save them from decay. When the first speck appears, go to the dentist. Dentistry has made such improvements during the last few years, that the poorest teeth can be made to last a long time. * * * * * What is said of boys and girls? When and how often should the teeth be cleaned? What should be used for that purpose? What is said of tooth-powders and tooth-picks?