De dentium affectibus

for indeed, of hotter blood rushing thither through the ducts of the veins, and causing inflammation in the highly sensitive membrane situated beneath.

XXIII.
The other cause, truly not infrequent, is a certain watery, serous, salty, or sharp humor, which descends thither through the passages, especially those destined for the transit of the nerves. Hence the membrane, thin in its essence and, as has been said quite often, of exquisite sensitivity, is irritated when imbued with an alien quality, or when raised into a tumor, it excites pain by bearing the touch of a harder body with the greatest difficulty.

XXIV.
Furthermore, this affection is communicated, on account of proximity, if it be more intense, for the most part to the jawbone itself; from which we see the gums and cheeks in such cases inflamed, the temples pulsing, and when the tumor has suppurated, pus finally emanating.

XXV.
But also, a throbbing pain is perceived in the teeth in no other way: except that the arteries, dilated by hotter spirit, and the veins, distended with richer blood, produce a sad sensation as they strike against the tooth.

XXVI.
We do not, however, concede that a defluxion a flowing down of humors is carried into the very body of the tooth, which is solid, entire, and unsuited for penetration; but only, as is easily understood from what has been brought forth, into those sockets which contain the inserted teeth.

XXVII.
But if the teeth have been hollowed and eroded: that which falls into them while chewing or by reason of the defluxion will not provoke pain, unless it reaches the membrane beneath, which in this case has sometimes been detected growing into the very cavity of the teeth.