The best natural remedy for treating bad breath is regular brushing of your teeth and tongue and flossing daily.
However, there are many other natural treatments that diabetics can try to beat bad breath:
Chewing some spices and herbs, such as cloves, anise seeds, or fennel, might help, creating your own mouth rinse that you can use after brushing could help, too. Try mixing extracts of myrrh gum, sage, and calendula in equal amounts in water and store it at room temperature in a sealed container or jar, eating parsley can also help because it is full of the breath deodorizer, chlorophyll.
Limit your intake of odorous foods like garlic, peppers, onions, and cheese, avoid beverages that can leave a smelly odor in your mouth, like coffee, any kind of alcoholic beverage, or soft drinks. These can leave a film of residue on your teeth, gums, and tongue. If you can't sacrifice these foods and drinks, simply try rinsing your mouth out with water after if you don't have your toothbrush with you. Although this won't completely get rid of all traces of what you just ate, it will help begin to restore your mouth to it's natural state.
Carry a toothbrush with you in your purse, car, gym bag, or in your medication bag that keeps your glucometer and insulin or other medications. You're probably carrying around your medication bag with you anyway. You can buy travel toothbrushes that fold if you need something more portable.
Gargling with over-the-counter mouthwashes can help mask bad breath. Some mouthwashes may even help prevent gum disease. Sugar free rinses are best for those with diabetes. Some mouthwashes contain alcohol, which can dry out your mouth.
If one treatment doesn't work, simply try another. If none of these options work, consult your dentist.