Can septra (sulfamethoxazole and trimethoprim) ds help infection in your gums and teeth?

Not really : For an acute abscess, it isn't the best antibiotic, but may be of some benefit. Is a combination of 2 antibiotics used most commonly for utis. Bacterial infections in the mouth generally indicate a need for treatment such as filling, extraction, periodontal treatments, or root canal therapy. Any antibiotic use would be short term, and septra (sulfamethoxazole and trimethoprim) isnt the best one for that.

No: No antibiotic can help infections of the teeth (cavities). Infection of the pulp (nerve, artery and vein) can be helped temporarily with septra (sulfamethoxazole and trimethoprim). Gum infections usually do not respond.