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For acute dental and gum infections, examples of suitable antibiotics include (adult doses) for 5 days: amoxicillin 500mg 8-hourly orally, or, metronidazole 400mg 8-hourly orally, or, if penicillin allergic: clarithromycin 500mg 12-hourly orally
How It Works. Antibiotics kill bacteria and are used to fight many types of infections. Antibiotics for an abscessed tooth are given in pill or liquid (oral) form, usually for a 7- to 10-day period.ntibiotics are used along with other treatment, which may include opening the root canal to drain the source of the abscess, lancing a swelling (gumboil) next to the tooth, or removing the tooth (extraction).