In regard to the pathology and therapy of the teeth, Guy but rarely abandons the footsteps of the Arabian writers. Following the example of one of these, Ali Abbas, he admits five or six dental maladies: pain, corrosion, congelation, and _agacement_ (teeth set on edge), limosity or fetidness, fall or loosening.[239] As to the cure, this is divided into universal and particular. The former includes, before all, hygienic rules, and then purgatives, bloodletting of the cephalic vein or the veins of the lips or tongue, revulsion, obtained by means of cupping glasses, friction, etc., and the remedies for curing the rheums of the head, or for throwing out the phlegmatic humors (pyrethrum, mastic, and the like). The hygienic rules are the following: Not to eat food apt to putrefy, such as fish and milk foods; to avoid food or drink either too hot or too cold, and especially the rapid succession of cold and hot, or _vice versa_; not to bite hard things, nor to eat viscous food, such as figs and confectionery made with honey; to avoid certain foods which are known to be bad for the teeth, such as leeks; not to clean the teeth too roughly, but to rub them with honey and burnt salt, to which, very advantageously, may be added some vinegar. Before speaking of the special methods of cure of single dental affections, Guy observes that operations on the teeth are _particular_ (proper) to barbers and to “dentatores,”[240] to whom doctors have abandoned them. But it is safest of all, says he, to have such operations performed under the direction of doctors. These, however, to be in a position to give advice in regard to diseases of the teeth, must know the various methods of cure which are suited to these diseases, that is to say, mouth washes, gargles, masticatories, fillings, evaporations, anointments, rubbings, fumigations, cauterizations, sternutatories, instillations into the ears, and manual operations. Lastly, Guy notes that the “_dentator_”[241] must be provided with all the appropriate instruments, that is, with “rasoirs, rapes, spatumes, droits et courbes, eslevatoires simples et à deux branches, tenailles dentelées, et diverses esprouvettes, cannules, deschaussoirs, tarieres, aussi des limes, et plusieurs autres necessaires a cette besogne” (in Latin: rasoriis, raspatoriis, et spatuminibus rectis et curvis, et levatoriis simplicibus et cum duobus ramis, tenaculis dentatis, et probis diversis, cannulis, scalpis et terebellis, et etiam limis.)[242]