The horse's mouth, showing the age by the teeth : containing a full description of the periods when the teeth are cut the appearances they present the tricks to which they are exposed the eccentricities to which they are liable and the diseases to which they are subject / by Edward Mayhew.
- Edward Mayhew
- Date:
- [between 1850 and 1859?]
Licence: Public Domain Mark
Credit: The horse's mouth, showing the age by the teeth : containing a full description of the periods when the teeth are cut the appearances they present the tricks to which they are exposed the eccentricities to which they are liable and the diseases to which they are subject / by Edward Mayhew. Source: Wellcome Collection.
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![of all the structures that enter the composition of the tooth. In proportion to the vascularity, maybe estimated the disposition to assume disease; and when it is further remembered that the crusta petrosa being the externa], is the most exposed portion of the tooth, and that any wrenching action, or other violence, would first affect this part, the dullest comprehension will perceive why the crusta petrosa is likely to be the primary seat of caries. Enamel is not subject to caries, nor is it otherwise involved than by being deprived of its supports, and chemically acted upon by the decomposed matters with which it is in con- tact. The ivory, however, may, in exceptionable cases, be the original seat of the affection; and when decay has commenced, this part of the tooth is speedily diseased. When caries begins, there is only partial death of the tooth ; but the portions which retain their vitality and are becoming affected, cause excruciating fits of agony. Before anything can be perceived by manipulating the molars, the animal may exhibit frequent slight fits of illness, being occasionally dull—off its feed — sluggish at its work—soon fatigued — resting the head on the man- ger, and displaying symptoms of transcient attacks](https://iiif.wellcomecollection.org/image/b28126221_0209.jp2/full/800%2C/0/default.jpg)
