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Look for 3% hydrogen peroxide at your local drugstore and dilute it with equal parts water. Vigorously swish the solution in your mouth and between your teeth for about 30 seconds. Gargle the hydrogen peroxide before spitting it out in your sink. Hydrogen peroxide works as an antiseptic, so it works efficiently and getting rid of bacteria in canker sores and minor infections. Avoid using undiluted hydrogen peroxide since it could damage the soft tissue in your mouth. Stir ½ teaspoon (2.8 g) of salt into 1 cup (240 ml) of warm water until it’s completely dissolved. Take a large sip of the salt water and swish it around your mouth for 30–60 seconds. Work the salt water through your entire mouth to ensure it reaches any sores or infections. Spit the salt water out as soon as you’re finished with your rinse.  Rinsing your mouth with salt water works well toothaches, canker sores, and minor infections. Avoid swallowing the rinse since it contains bacteria and could make you feel sick. Saltwater may sting canker sores if you have any, but it will only be temporary.

Summary:
Rinse your mouth with hydrogen peroxide to get rid of harmful bacteria. Do a warm salt water rinse to disinfect your mouth.