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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.
Most cases of bad breath are caused by conditions in the mouth. Bad odor from the mouth can be caused by: 1  poor oral hygiene (This is the most common cause of bad breath.). 2  dental problems like gum disease, cavities, and abscessed teeth.3  dentures. 4  certain foods and drinks like garlic, onions, and coffee.5  tobacco products.6  alcohol.ost cases of bad breath are caused by conditions in the mouth. Bad odor from the mouth can be caused by: 1  poor oral hygiene (This is the most common cause of bad breath.). 2  dental problems like gum disease, cavities, and abscessed teeth. 3  dentures. 4  certain foods and drinks like garlic, onions, and coffee. 5  tobacco products. 6  alcohol.