Hi Customer (name blocked for privacy)--glad to be of service:
Of the 2 Avelox (aka. Moxifloxacin) is definitely the better choice for a Tooth Abscess; it kills most Strep. and Staph. species bacteria, which are the likely pathogens.
For pain (since darvocet didn't help, I would recommend 3 Advils every 6 hrs, w/ food; until your dentist can give a stronger pain killer tomorrow).
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--Dr. Steve
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Info given herein is general health info, and NOT a substitute for needed M.D. attention