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The nose

Most cases of bad breath (perhaps 80 or 90%) come from the mouth itself. Most of the remaining cases can be traced to the nose. This can be easily ascertained by comparing the smell coming from someone's nose and mouth. If the smell is almost entirely from the mouth, then it is most probably coming from the mouth, (or perhaps throat). If the smell is coming primarily from the nose, then the nasal passages are likely involved. In some cases, people have oral and nasal odor simultaneously. In this case, there is odor from the mouth and the nose, but they differ in their character. In very rare cases, the smell exiting from the mouth and the nose is the same. Only in such cases, can one suspect a problem emanating from the lungs or other parts of the body.

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