Boil 2-1/2 cups distilled or mineral water, 1 tsp fresh mint leaves, 1 tsp rosemary leaves add 1 tsp anise seeds, infuse for 20 minutes. Cool, strain and use as a gargle/mouthwash. If you wish to make up a larger quantity, double or triple the recipe then add 1 tsp of tincture of myrrh as a natural preservative.
Wash your mouth with half a glass of warm water containing a teaspoon of table salt.