How long will it take for an antibiotic to reduce pain of a tooth infection?

Tooth infection. From my experience it usually takes about 48 hours after the first dosage until the tooth pain starts to diminish noticeably. This could vary depending on the severity of the infection. Make sure to follow the directions exactly as prescribed.
Antibiotic = Limited. Antibiotics do not reduce the infection, they only assist in relieving the spreading of the infection to other areas. A swelling from infection will generally only do down once the infection has opened a place to drain to - either inside or outside of the mouth, you must go to a dentist that can either do an extraction of the tooth or possibly start a root canal therapy. Now.
Average 24 hours. Typically, patients will have some pain relief from an abscess after taking antibiotics for 12-36 hours.
2-3 days. Antibiotics usually start working in 24 to 36 hours, however when the infection is in a tooth or jaw (bone) it takes longer merely because the blood supply isn’t as good in that kind of tissue. Warm compresses help to increase the blood flow to the area and carry the meds to the area.