Salt can also be used to treat cavities due to its antiseptic and antibacterial properties. It can reduce inflammation, ease pain, draw out any infection and prevent growth of bacteria in the mouth.
Dissolve 1 teaspoon of salt in a glass of warm water. Swish a mouthful of this solution around in your mouth for 1 minute, concentrating on the affected tooth. Follow this treatment 3 times a day until your symptoms subside.