There are many home remedies for bad breath; one of the most popular is apple cider vinegar. Apple cider vinegar is believed to work by restoring the pH balance in the mouth, which can help kill odour-causing bacteria. It also contains acetic acid, which has antibacterial properties. To use apple cider vinegar for bad breath, mix one tablespoon with a cup of water and gargle before spitting it out. You can do this several times a day. Some people find that their bad breath improves after using apple cider vinegar for a few days. Do not use it for extended periods because vinegar is acetic acid and can cause sensitive teeth and dental erosion, where your teeth melt away over time. . If your bad breath is not helped by apple cider vinegar, it’s best to visit a dentist.