Root canal of my left side (2nd last tooth) is due. I have ignored actually since it was not hurting. But there was a small bulge on the gum below the tooth. All of a sudden a gradual swelling on the cheek started to grow painless though. But now my left cheek n chin area is badly swollen and mild pain in tooth has occurred. What can be done for immediate relief. However I will go to the doctor tomorrow. But how do I reduce swelling and pain for the time being.