thanx for sharing your concern,
as you know your husband has impacted third molar which has developed an abscess
over it .
remember an abscess is infectious consisting of loads of bacteria , bacterial toxins, debries , and purulent materials (PUS).
abscess is cured by drainage
followed by antibiotic treatment , only antibiotic does not help much in case of dental treatment.
you have found brown extremely foul smelling discharge is nothing but pus oozing out from the abscess in relation to third molar . this can lead to infection in the surrounding spaces too.
therefore i would suggest you to visit your dentist
, get started with a new course of antibiotic and analgesic
. under its coverage , you can go for a minor surgical procedure for extraction of third
taking a course of antibiotic might subside your problem now , but this is not the permanent cure.
in this case , an impacted third molar has to be surgically removed for permanent solution.
this should help