Whatever you do don't get a root canal.
Oil pulling may have it's merits, but I would think in your case it would aggravate the tooth that's sore.
No way to know if this would help the infection, but you might try Colloidal silver. Just put a couple of ounces in your mouth, swish it around for a while. Repeat often. You will know within a day if it feels better. That doesn't mean it will heal. If not the next thing I have heard about for dental infections is the laser.
If you have it removed, be sure to seek out a holistic type dentist.
The best preventative for teeth cleaning besides brushing is a waterpik filled with water with a couple of ounces of H202.
My last dental visit the dentist came in to check my teeth and remarked "I don't know what you are doing, but keep it up"
The hygenist used to spend time measuring gaps between the gums, and teeth. Now there aren't any. That's where the problems begin.