An elementary physiology and hygiene for use in upper grammar grades . Y AND HYGIENE stance within. We should never pick the teeth withanything hard, such as needles or pins, because theseare liable to scratch, and so crack, the enamel. Foithe same reason we should not crack nuts or otherhard substances with the teeth. It is also harmful tothe teeth to take extremely hot and cold foods ordrinks in close succession. Particles of food lodged between the teeth becomedecayed and help to decay the teeth in turn. It iswell, therefore, to brush the teeth after each meal, andalso at night, so as to re
An elementary physiology and hygiene for use in upper grammar grades . Y AND HYGIENE stance within. We should never pick the teeth withanything hard, such as needles or pins, because theseare liable to scratch, and so crack, the enamel. Foithe same reason we should not crack nuts or otherhard substances with the teeth. It is also harmful tothe teeth to take extremely hot and cold foods ordrinks in close succession. Particles of food lodged between the teeth becomedecayed and help to decay the teeth in turn. It iswell, therefore, to brush the teeth after each meal, andalso at night, so as to remove any bits of food thatmight do injury if allowed to remain. To keep theteeth healthy and sound, it is necessary, in addition to brushingthem, to re-move, with asoft toothpickor thread, allbits of foodwhich cling tothem. Whena tooth beginsto decay, itshould be at-tended to atonce by a den-tist ; for if the small cavities are promptly filled, the tooth mayperhaps be preserved for years, and much pain andexpense be saved. Uvula Pillars or fauces •• 7cvw//—. Eig. 10,—The the opening into the throat. DIGESTION 41 Figure 10 shows the open mouth as it appears whenwe look within. Notice the palate and the placing the tip of the tongue on the roof of themouth just inside the upper teeth and drawing thetongue slowly backward over the roof of the mouth,we can discover the difference between the hard andsoft portions of the palate. Salivary Glands.—If some one says the word lemon,our mouths are aptto water, as we thinkhow sour the juiceof the lemon is. Thefluid which moistensthe mouth, andwhose flow is thusincreased by the aidof the imagination,comes from theorgans known as thesalivary glands. Theliquid produced iscalled saliva. Thereare three pairs ofsalivary who have hadthe mumps can locate one of these pairs of glands without difficulty. Theseare the parotid glands, which are inflamed and swollenin that painful disease. They are situa
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectphysiology, bookyear1
