Hi it sounds like you might have acute necrotising ulcerative gingivitis if hes given you metronidazole. If its just gingivitis in which the gums bleed good oral hygiene and a professional cleaning will suffice. If it is ANUG then the metronidazole will help along with a scaling and good oral hygiene . Ask him to clarify what the infection is as antibiotics are not necessary for ordinary gingivitis.
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