Here is a great article from cheatsheet.com regarding 6 Ways to Instantly Cure Bad Breath:

Americans today are obsessed with the concept of “being clean.” We are afraid of germs, odors, bad breath, you name it. Yet the world didn’t always operate this way. It wasn’t until the 1920s when Listerine was marketed as a cure for halitosis. Halitosis, or bad breath, actually wasn’t a problem until Listerine made it one. Thus begins our descent into a problem that now plagues over 65% of Americans.

Whether or not advertising created this falsehood about bad breath, (thanks Listerine!) bad breath is a condition that has plagued all of us at one point or another. If you have a low tolerance for horrible breath, it can actually ruin relationships and sour friendships. Sounds crazy, but bad breath is also a very embarrassing thing. No one wants to be known as the friend with constant bad breath.

Bad breath isn’t only caused by the foods you eat, but actually arises from various dental problems. Bad breath comes from oral ulcers, dental decay, oral infections, nose and throat infections, indigestion, food, medications, and even stress, anxiety, depression, alcoholism, fasting, and smoking.

Some tips, brush your teeth after every meal. Carry a travel toothbrush wherever you go. Also eat crisp, natural foods. Healthy foods increase our health AND dental health.

Oftentimes, gum or mints don’t rid mouths of nasty odors, but luckily there are other ways to cure bad breath to ensure it won’t creep back 10 minutes later.

1. Gargle with apple cider vinegar

This acidic substance has been used for centuries and is known for eliminating bacteria, especially in the mouth. It has antiseptic properties that help break down plaque and helps digestion when consumed, which may help bad breath caused by indigestion. Plus, ACV has tons of essential minerals that are necessary for health. Eithergargle with ACV for 10 seconds, or mix 1 tablespoon in an 8 ounce glass of water anytime you encounter bad breath. This substance may taste nasty and potent, but the effects will have this be your go-to cure.