about 2 years ago I had some quite bad tooth decay but my dentist said a root canal wasn't required and filled it. In the past month or so I think the filling has come out and last night my gums in that area of my mouth have swelled. I have a dentist appointment booked in for just over a month away but I'm not sure if I should change it to urgent and try and get it sooner? I've had no pain with this tooth at all and the decay seems to only be down the edge of it but the swelling has really concerned me