My wife has been suffering cough for 3-4 months and always feel bad for bad smell from her mouth.
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Chronic lung infections and presence of chronic sinus infection (sinusitis) can cause bad smell from mouth. I feel you should consult with general physician for diagnosis of her disease. After the treatment of infection if still bad breath present you can have a consultation with dentist. I feel bad breath is secondary to respiratory infection, nothing to worry get your disease treated and bad smell will be solved.
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Get scaling polishing done by a dentist than brush twice daily especially at night use betadine mouth wash drink plenty of water.
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Bad breath can be due to the pharyngeal infection or sinus infection as in cough n cold. It should be relievd when you recover from cold n cough. You should also not ignore local oral factors like deposits on teeth n cavities which also produce bad breath and made obvious by cough. So dental chk up is also must.
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