text: can septra be used to temporarly treat an infected abscess tooth?   yes, it may cover most of the bacteria that typically cause oral abcesses.  however, it does not cover what we call "anaerobic organisms".  if you do not feel better after 24-48 hours, or if it gets worse in the next 24 hours, talk to your doctor to get an alternative (clindamycin or augmentin).  also, septra has a sulfa component, so please do not take it if you have had a severe allergic reaction to sulfa in the past.