Question: how long does it take for metronidazole to work on a tooth infection?
Answer: A 10 – 14 day course is recommended because, although 70% of patients respond to metronidazole in five days, 91% respond with a 14 day course. Metronidazole can be given by intravenous infusion if oral treatment is inappropriate. Vancomycin is reserved for severe C.