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Forum Topics: The second set, or permanent teeth, then, lying under the milk-teeth and hidden in the jaw, undergo in this situation their full developement, before they appear above the gum. This occurrence commences about seven years of age, at which period the first set begin to fall out from their roots becoming absorbed, and no longer retaining their hold of the jaw; to be entirely replaced in the course of a few years by the permanent set, which thus succeeds them. The first teeth of this set which make their appearance are the large double teeth, which emerge from the gum immediately behind the last of the temporary set. Next the two front teeth of the lower jaw fall out, and are succeeded by two others of similar character and form, but of larger size; then the two corresponding teeth of the upper row are cast off, and their place supplied; shortly after the teeth immediately adjoining these; then the double teeth of the first set are exchanged for their smaller successors of the second. The eye-teeth after a time begin to make their appearance; and then more double teeth; making in all twenty-eight teeth, and occupying in their developement from the seventh to the fourteenth year of age. They are not, however, yet complete; for between the latter date and the twenty-first year four more teeth appear, called the wisdom teeth, making the adult set or permanent teeth to amount in all to thirty-two teeth. It should be observed, that whilst this is the most usual course in which this set appear, the line of succession is sometimes different.
THEIR VALUE AND IMPORTANCE.
It would seem almost unnecessary to say a word upon so self-evident a truth, and yet perhaps the full extent of this statement is not generally appreciated. It has not, perhaps, occurred to the minds of all, that upon the right position and arrangement of the teeth the beauty and expression of the countenance much depends. But so it is; for however regular and perfect the general features, if the teeth are irregular or deficient, an unpleasing expression, proportionate to the extent of the displacement, is inevitably produced. Now every mother should be alive to this fact, that she may early apply to the dentist to have any error of the above nature rectified, before it is too late.
On their complete and entire state also depends the perfection of utterance and articulation. The child, for instance, makes no attempt at articulation until it has acquired several teeth; this faculty becomes also exceedingly imperfect during the process of changing them; from this time it continues to improve, until again it is permanently impaired in old age, when they are finally lost. And so again, if a child lose merely a single tooth from the front of its mouth, lisping will result; or if a supernumerary or irregular tooth be present, the articulation will be abrupt and imperfect:--the former plainly showing the importance of the entireness of the series, and the latter, the necessity of regularity in their arrangement and position.
The teeth, however, are chiefly important in relation to the part they sustain in connection with digestion, viz. the mastication of the food. By this act the food, after being received into the mouth, is mixed with the saliva and broken down, till it becomes of an uniform pulpy consistence, fit for being easily swallowed, and acted upon by the gastric juice on its arrival in the stomach. That due mastication of the food is essential to healthy digestion, which will be promoted or retarded in exact proportion as it approaches or falls short of this point, is a fact so generally known as scarcely to need comment. Suffice it to add, that, if food be introduced into the stomach unmasticated, the gastric juice will only act upon its surface; and after a number of hours it will be either rejected by vomiting, or pass on into the intestine, to give rise to cholic, bowel complaints, or flatulence, and very frequently in children to a serious attack of convulsions.