. Oral pathology and practice. A text-book for the use of students in dental colleges and a hand-book for dental practitioners. hey are found onlyupon the buccal or labial aspect, occasionally on the proximate, ACQUIRED OR ACCIDENTAL IMPERFECTIONS OF ENAMEL. 235 and very rarely upon the lingual surfaces. They do not seem to-be necessarily connected with any special diathesis, for they arefound in the teeth of people who show no indications of gout,rheumatism, or any of the diseases to which they have by somebeen attributed. No explanation has ever yet been presentedthat will account for all ca
. Oral pathology and practice. A text-book for the use of students in dental colleges and a hand-book for dental practitioners. hey are found onlyupon the buccal or labial aspect, occasionally on the proximate, ACQUIRED OR ACCIDENTAL IMPERFECTIONS OF ENAMEL. 235 and very rarely upon the lingual surfaces. They do not seem to-be necessarily connected with any special diathesis, for they arefound in the teeth of people who show no indications of gout,rheumatism, or any of the diseases to which they have by somebeen attributed. No explanation has ever yet been presentedthat will account for all cases of abrasion. Chemical solution bymineral acids is not sufficient, because any acid sufficient toaccount for the erosion of the surfaces of incisors mustmanifest itself in other ways; besides, this at timesoccurs when the reaction of the oral secretions isnot strongly acid. It has been attributed to electro-chemical cur-rents which produce electrolysis. The improbability—nay, more,,the absolute impossibility—of the existence of such currents in themouth seems too apparent to need demonstration. There is no Fig. Erosion of the Teeth. (Darby, from Burchard.) question that electrical currents are constantly being formed by theincessant chemical action and the different molecular changes thatnever cease in the oral cavity, but it must also be as true that theyare as perpetually and as instantly dissipated. There can be no-closed circuits, nor any such thing as accumulation; and hence,while theoretically they may be present, practically they must asinevitably be powerless for either good or evil, vanishing on theinstant of their birth. It seems to be true that while the acid reaction in someinstances of erosion may be weak, so far as observation goes italways exists. It is well known that organic acids in their nascentstate are most active. While, therefore, through fermentation orin a degenerative state of the mucous follicles an acid may bycombination be formed in a ci
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