I just search the internet on bad breath natural remedies and am going to try some too:

Cloves are a powerful antiseptic. Make a mouthwash by putting 3 whole or 1/4 teaspoon ground cloves in 2 cups of hot water, and steep for 20 minutes, stirring occasionally. Pour through a fine strainer and use as a mouthwash or gargle twice a day.

Water, salt Gargling with salt water will help clean out bacteria, mucus and food particles on your tonsils or the back of your throat that may be causing your bad breath.

Tea tree oil Tea tree oil, derived from the leaves of the native Australian Melaleuca alternifolia tree, contain antiseptic compounds that make it a powerful disinfectant. Try using a toothpaste containing tea tree oil, or put a few drops of tea tree oil on your toothbrush alone, or with your regular toothpaste. It has a strong aromatic flavor.