Cranberry juice has the potential of killing the bacteria so it can be used as a mouthwash.
A 50% solution of vinegar or apple cider vinegar can help to dissolve deposits of calculus.
Mix 1 cup warm water, 1/2 teaspoon myrrh tincture, A few drops tea tree oil, a few drops peppermint or mint oil and gargle.
Boil 6 ounces water; add 4 teaspoons liquid glycerin and 1 teaspoon aloe vera gel. Remove from the heat, let cool slightly. Add 10-15 drops spearmint oil, shake well. Pour into bottle, cap tightly.