I was told I have a leaking filling after complaining about this tooth hurting for over a year.. It has a bad taste around there and the gums hurt. Now it feels like the nerve is pulsing and trying to get out. My appt is not for 4 weeks to get the filling replaced. Does this need a root canal or will replacing the filling stop the pulsing and discomfort? I was told the tooth is still alive but maybe on the outs. I don't want to waste money but this is tooth #10 right in the front. I think it also looks slightly greyer than the surrounding teeth. Should I wait for my appt or try to get in sooner?