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== What are the symptoms of bad breath? ==
While the most obvious symptom of bad breath is, well, bad breath, there are other symptoms one can watch for. These include a white coating on the tongue, a dry mouth, or excess mucus entering the back of the throat from one's nose or sinuses - usually stemming from nasal irritation, allergies, or a bacterial infection. "This is called a post-nasal drip and often accompanies mouth odor," says Heath.

And because bad breath is often associated with tooth decay, plaque buildup around one's teeth can be another sign to look out for. "Persistent bad breath can be a warning sign of gum disease, which is caused by genetics, leftover plaque, or both," says Price.

It's worth noting that gum disease and post-nasal drips can be either symptoms or causes of mouth odor.