Despite my teeth having been fixed,the space between my two upper back molars always get lodged with food?

Even if I brush, regularly or floss everyday, still that particular space in between the teeth always get easily lodged with meat, whatever...as a result, my gums is always swollen, sometimes mildly, sometimes appears to heal, then gets swollen again as soon as food particles get in. It's really starting to get into my nerves. My dentist also tried to somewhat enlarge the space by carefully reducing the side/s of the teeth concerned but still it has always been a favorite place for food particles to enter into. Please what should I do. I'm all the more worried about it, especially after I've just read the article on this link:a href="http://health.yahoo.com/news/afp/healthdiseasehearthygieneteeth_080910231639.html"http://health.yahoo.com/news/afp/healthd…/a