What causes the common cold? A group of viruses. What's behind stomach ulcers? A single strain of bacteria. What causes tetanus? A single species of microbe (not rust, as you might expect). And bad breath? In all, halitosis probably has more than 100 causes: oral bacteria, dental plaque, tartar, gingivitis,...
(0) Comments | Posted March 19, 2013 | 4:57 PM