As a mild antiseptic and disinfectant, hydrogen peroxide works similar to a salt water rinse by reducing inflammation. It also may heal sore or damaged gums, which can reduce tooth sensitivity.
To make your own rinse, mix 2 tablespoons of hydrogen peroxide—3% hydrogen peroxide works best—with 2 tablespoons of warm water. Swish around your mouth for a few minutes, and spit out when done.
Take Care With Some Remedies
You should be cautious when using some of these remedies, such as hydrogen peroxide, so you don’t use too much. For instance, using a stronger concentration of hydrogen peroxide than directed—in this case, 3%—could damage the tooth’s enamel.