Lectures on operative dental surgery and therapeutics . he ducts of theparotid and sub-lingual glands, until retrocession of thegum is induced. Attempts to clean the teeth now causeso much irritation that they are frequently neglected,and the disease permitted to go on uninterruptedly, tothe prejudice of both teeth and gums. This conditionappears, in some instances, to be tolerated with little orno inconvenience, until the tartar nearly reaches the apicesof the teeth, increasing until several teeth are cementedtogether by the deposit, which becomes so large that itscontour can be traced extern

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Lectures on operative dental surgery and therapeutics . he ducts of theparotid and sub-lingual glands, until retrocession of thegum is induced. Attempts to clean the teeth now causeso much irritation that they are frequently neglected, and the disease permitted to go on uninterruptedly, tothe prejudice of both teeth and gums. This conditionappears, in some instances, to be tolerated with little orno inconvenience, until the tartar nearly reaches the apicesof the teeth, increasing until several teeth are cementedtogether by the deposit, which becomes so large that itscontour can be traced externally upon the cheek (see Eg.83.) But sometimes it is accompanied with much discom-fort, anorexia, and general derangement of the system, while absorption of the alveolus and loss of the teeth areamong the disastrous sequelae, a case in point being givenin fig. 84. The two specimens which are here illustrated show towhat extent salivary calculus may be tolerated in the 196 mouth, fig. 83 representing the exact dimensions of amass taken from molar teeth.. Fig. 83. In fig. 84, the attachment of tartar to the Hngualsurface of a lower incisor increased in bulk until, by its erosive influence upon the gum and alveolus, thetooth was lost. From these considerations, it will beseen that the treatment of teeth with tartar upon themis important, and the operation of scaling a necessaryprophylactic measure. The instruments used in the removal of tartar are toowell known to require description here, further than thattheir forms should be adapted to the varying aspects ofthe teeth, and, while using them, every precaution takento avoid injury to the enamel; the junction of the surfacesbeing the line of cleavage. In cases of alveolar absorp-tion and retrocession of the gum, carbolic acid may beapplied by means of a stick of orange wood, flattened atthe end, so as to permit the ready introduction of themedicine between the teeth and gums. Aromatic sul-phuric acid is also sometimes used with most