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Between 80 to 90% of Bad breath originates from the mouth itself. Most of
the remaining cases can be traced to the nose. This can be checked 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. In such cases, one can suspect a problem
emanating from the lungs or other parts of the body.
The nasal passages constitute the
second most frequent source of bad breath, after the
mouth itself. Nasal odor may lead to the discovery of sinus and
other infections, obstructions, foreign bodies, etc.,
but many instances are unaccompanied by pathological findings. Many foul smelling samples scraped
from the posterior part of the tongue dorsum bear a
physical resemblance to nasal mucus. It is thought that
these scrapings are the remains of putrefied post-nasal drip.
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