Excerpt from The Independent Practitioner, 1886, Vol. 7
It will at once be seen that these crystals could not be formed without free phosphoric acid. Here are four distinct tests, and any one of the three last named sufficient to fairly prove the presence of free phosphoric a... cid. Then, if phosphoric acid is present in decay, there can be no other source for it than from the phosphates of the tooth. So abundant are the proofs of free acid, and the almost entire absence of phosphates, that I am led to believe that this acid alone is the main factor in tooth destruction, and beyond question responsible for the acid reaction so persistent along the border line between decay and sound tooth structure, the presence of acids deo rived from food, etc., playing a very insignificant, or no part at all, in deep-seated dental caries.
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