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1 Persistent bad breath or a bad taste in the mouth can also be one of the warning signs of gum disease; which is caused by plaque.  Dry mouth. This occurs when the flow of saliva decreases and can be caused by various medications, salivary gland problems or continuously breathing through the mouth.
Cough may be present, and sometimes patients have fever. Other symptoms can include earache, pain in the jaw or teeth, nausea, sore throat, and a decrease in the sense of smell. Discharge (postnasal drip) may be present in the back of the throat that produces cough and bad breath.