“After the evacuation of purulent matter or pent-up gases from the pulp-chamber, apply to the gums, over the implicated tooth, one or two good Swedish leeches. American leeches are unruly and difficult to manage in the mouth or upon any circumscribed surface. Each leech will draw about a fluidrachm [fluid drachm] of blood. After their removal the hemorrhage can be almost indefinitely prolonged by wiping away the clot as fast as it forms in the wound made by the leech and directing the patient to rinse the mouth with warm water as long as it may be desirable to continue the bleeding.”

https://www.youtube.com/watch?v=cePKpt5nOJ0

“The action of tobacco upon the fungi is worthy of note. Five grammes of old Virginia plug were boiled fifteen minutes in 50 c.c. of water, the loss by evaporation being constantly replaced; the decoction was then filtered and a portion added to an equal volume of saliva with sugar. This produced a mixture scarcely stronger than that which many veteran chewers carry around in their mouths all day, and in it the fungi led only a miserable existence. Much more remarkable, however, was the action of tobacco-smoke upon the fungi, the smoke from the first, third, or last quarter of a Colorado Claro cigar being found amply sufficient to sterilize 10 c.c. of a beef-extract-sugar solution previously richly infected with caries fungi.”

Dr. Miller (same source as above) wrote …

“In consideration of the strong antiseptic power of tobacco-smoke, we might be inclined to infer that tobacco-smokers should never suffer from caries of the teeth; it is evident, however, that there are very many points in the dental arch to which the smoke never penetrates.”