Anal fistula seton

Hi everyone. I'm new to this. I was hoping someone could help me out, give me some advice. So here's the situation: I have an anal fistula, they did the whole cut me open and try to get it off the tract. I had my 8 week check in and doctors said it wouldn't heal on its own. So he said I'll have to get a seton in place, the rubber band idea one. He said I'll have it in me for 3-4 months. Has anyone ever had this done? What should I expect? Does the seton come out or does it stay in me forever or dissolve. How does it even work? I've tried googling but can't find many answers.

Hope you guys can help! Thanks!!

As Scifi said, it depends if you have Crohn's. I have Crohn's and have had a fistula/seton for about 10 years.
If you have Crohn's, surgery does not have a high success rate. However, there are biologic meds to try to close up the fistulas. Remicade closed mine 10 yrs ago but I had an allergic reaction and had to stop taking it. It reopened shortly after that and I've lived with a seton ever since.
If you don't have Crohn's, surgery is an option and can be successful.