Many conditions, such as postnasal drip, chronic bronchitis
Here are a few home remedies that may work for you.
1. Fresh guava is helpful in halitosis. It is source of tannic, malic, oxalic, and phosphoric acids as well as calcium, oxalate, and manganese. Chewing it is an outstanding tonic for the teeth and gums. It helps cure bleeding from gums and discontinues bad breath. Munching or chewing tender leaves of guava tree also stops bleeding from gums and bad breath.
2. Try a mouthwash containing zinc ions. Zinc appears to directly neutralize malodorous sulfur compounds and improve breath. It's found in several health food store mouthwashes as well as some drug store brands.
3. Are you constipated? That is not a dumb question. If you are constipated, then it is like having the sewage system back up at your house. We all know what that smells like. So take natural laxative like odorless, liquid aged garlic or aloe vera juice, and wait for your system to clear out, and your breath will smell a lot better.
4. Mix extracts of sage, calendula, and myrrh gum (all available at health food stores) in equal proportions and gargle with the mixture four times a day. Keep the mouthwash in a tightly sealed jar at room temperature.
5. The teeth should be washed two times in a day, particularly before going to bed at night. Meat particles should be detached carefully with toothpicks. In case of decaying teeth and swollen and bleeding gums, advice of dentist should be taken. Chewing a raw apple or guava after lunch eliminates most of the trapped particles.
6. According to traditional Chinese medicine, bitter foods, such as Belgian endive and many dark green leafy vegetables are also believed to help stomach heat. Certain foods, such as coffee, alcohol, sugar, milk and fried or spicy foods are thought to worsen the problem.
7. Chew on some fresh parsley or alfalfa, especially after eating garlic, onions, or fish. The chlorophyll in these two plants kills the offensive bacteria in your oral cavity. This is one of the best bad breath cure.
8. Other herbs and spices in your kitchen are natural breath enhancers. Carry a tiny plastic bag of cloves, fennel, or anise seeds to chew after odorous meals.
9. Drink green tea. And it doesn't hurt to swish it around in your mouth before you swallow it: it will kill the harmful bacteria in your mouth. Avoid eating cheese, milk, products containing yeast, garlic, onions, and any other odorous food.