Root canal. Reduce swelling by it on.

Respected mam. Or sir recently i have done my root canal in upper wisdow teeth but while doing a root canal 1 time  by an dentist sir I have ab infection in my mouth and they done my root canal in a infection  way and again after consulting a doctor they told me my root canal is not done in a proper way in an exray they check  I have to do a re root canal again and my infection have speard it in my another teeth and root so I consult a periodentist and they remove my infection root  by a minor surgery and done a stitching recently it was 7 days completed and they now remove the stitches and done my re root canal. And now in an exray when they check my infection became so less and doctor told me infection it will. Go by it own and now sir my problem is  in that place where they done a stitching I have a minor swelling in that affected place and doctor told me do. Only a salt water rinse gargle and do a mouth wash  it will reduce swelling by it on..