The best way is oil pulling. Colloidal Silver swish is good too, just don't swallow it after swishing.
My suggestion is to add taking Turmeric 1tbsp twice a day with warm water. This will help internally. You can also use clove oil on that tooth before going to bed. If you have tartar under gums then do Periogen swishes. It works best with a waterpik.
If you are not already doing it, don't eat sugary foods, cold foods. After Antibiotics you must eat foods with probiotics, like Kimchi, Kefir, Sauerkraut and Yogurt.