These nutrients strengthen gums, protect against tartar and bad breath, and may even whiten your teeth over time. High in iodine, salt has antibacterial properties and helps neutralize acids in the mouth. Salt makes you salivate, and your saliva creates an antibacterial barrier that protects your enamel.
Increased amount of saliva acts like a rinse removing food particles from in between teeth, preventing dental plaque build-up. Natural process of remineralization of tooth enamel requires alkaline environment in the mouth, salt rises pH. and makes saliva alkaline thus helping this natural process.