Cloves, grown in tropical climates but not in the US, release an oil when they are scraped or bruised that acts as a temporary skin anesthetic. Since you will probably not be growing these in your garden, simply purchase any brand of cloves from a local grocery store in the spice aisle. Take about ten cloves and remove the stems, then wrap them in a piece of cotton and roll this package back and forth on a countertop, or crush it lightly in your hands. Discard the pieces of cloves and wipe the sore tooth and gum with the oil on the piece of cotton. Another option is to bruise a clove slightly, then roll it around in your mouth. You may also be able to find Oil of Cloves at a health food store.