A root canal will save the tooth, but at the expense of your overall health.
Nobody wants to lose a tooth, but the tooth if saved by a root canal will dump bacteria, and other toxins into your blood stream where it can travel to anywhere in your body to cause problems.
Root Canals are dead teeth. They are no longer serviced by the blood, and antibodies that protect you. Getting all the root out of a tooth is impossible, so what is left will rot, and create bacteria.
Do yourself a favor, and a lot of later trouble and have it removed. The older they are, the worse they are.