Answers:
Traditionally antibiotics of the penicillin class be used for oral abcesses. Of the two medication you mention, the erythromycin would be most similar to a penicillin class antibiotic. There are others which would probably be more impressive, but of those two use the erythromycin.
However, my opinion is to see a dentist. Remember an infection in a tooth is singular centimeters from the brain, don't nick probability.
EDIT: on further care, both medication are indicated for dental infection, I have a feeling the erythromycin have a broader spectrum of dealing and if using the medication empircally (without a designated organism) metronidazole would not be my first choice. Metronidazole is completely honourable at anerobic coverage, but I would select it for intra-abdominal and other such infections and use the erythromycin for skin and oral issues and infections of the upper respiratory system first, in a pateint lacking a bacterial culture to guide me.
depends entirely on the strain of bacteria cause the infection
Different antibiotics eradicate different types of microbes... what works great on gram-positive germs may be entirely ineffective on gram-negative. It help to know at least possible the type of germs cause the infection, although generalization can be made sometimes and a broad-spectrum antibiotic used.
However, metronidazole is successful against anaerobic microbes... and since an abscess is an infection site isolated from regular tissue, it is possible that lower oxygen level are present which favors growth of anaerobic germs. so I'd guess metronidazole.
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usually it is metronidazole and a penicillin combo to be exact used as the two combined cover a complete host of bugs usually found within the mouth.erythromycin can be used as a substitute for penicillin if in that is an allergy etc.