1. Garlic. Garlic has anti-inflammatory and natural antibiotic properties that make it highly effective for treating an abscessed tooth. It helps relieve pain and prevent the spread of the infection. 1  Put a fresh garlic clove in your mouth and crush it with your teeth.2  Chew it until the pain subsides. 3  Spit it out and rinse your mouth with warm water. 4  To reduce the residual odor, you can add a few drops of clove oil to the warm water.. Garlic. Garlic has anti-inflammatory and natural antibiotic properties that make it highly effective for treating an abscessed tooth. It helps relieve pain and prevent the spread of the infection. 1  Put a fresh garlic clove in your mouth and crush it with your teeth. 2  Chew it until the pain subsides.