Apple cider vinegar’s acidity kills the bacteria that cause tooth decay and many gum infections like gingivitis. You can also use apple cider vinegar to remove stubborn tooth stains.
Apple cider vinegar's acidity is high, so I suggest diluting it before using. Mix one teaspoon of apple cider vinegar with a cup of water to get the best result. Then, use it as you your mouthwash.
Use twice daily.