Yes Apple Cider Vinegar can cure bad breath as it does work for me to get rid of bad breath.
Take a tablespoon of apple cider vinegar before eating a meal. Take the apple Cider Vinegar with every meal you eat as Apple Cider Vinegar works to get rid of bad breath by helping your body digest the food you eat faster and easier.
You can also drink a glass of water diluted with a tablespoon or two of Apple Cider Vinegar and drink that with each meal and your bad breath should be gone.
Also brush your teeth after every meal and floss twice per day to help keep the bad breath away.