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How to fix bad breath on the spot
Use a portable toothbrush.
Some people who suffer from halitosis or are self-conscious of their breath will carry around a toothbrush with them. Bring a small tube of toothpaste.
If you don't have toothpaste, know that brushing with tap water can help reduce the smell of microbes that collect when you eat meals. Small, portable toothbrushes can be purchased at any grocery store or pharmacy cheaply.