Pour about eight ounces of warm water into a glass and stir in two tablespoons of salt until it's completely dissolved. Rinse with the water for twelve seconds, or as long as you can stand the salty taste, and then spit it out. Repeat the process every few hours, and you'll begin experiencing pain relief. A salt water mouth rinse can reduce bacteria on your teeth and gums because it temporarily increases the pH balance of your mouth and creates an alkaline environment in which bacteria struggle to survive.