###Human: I have a swelling on the gum of a painful tooth. What is it? ###Assistant: Hi. I have gone through your question. I can understand your concern. It looks you are having repeated sinus drainage, it is a localized infection because of that infectious tooth. I would have provided you a better possible diagnosis and treatment plan if you would have uploaded a picture. You can take Ofloxacin 200 mg twice daily and Metronidazole 400 mg thrice daily for five days. Your problem will be solved. But it is not a permanent solution you either need to get a root canal treatment done or get it removed. To check whether there is any chance to save this tooth, I need a photograph of your tooth with this ball.